“We never fight alone. We've never done that. You can go all the way back to the days of Revolutionary War. The United States has never gone into conflict on its own. We've always built coalitions. We've always involved partners and allies. And we'll continue to do so going forward.”

That was Gen. Ronald P. Clark, Commanding General, U.S. Army Pacific Command, speaking last Tuesday at a contemporary military forum, Decisive Landpower -- Deterrence and Partner Integration Against the Pacing Threat, as part of the 2026 Association of the United States Army (AUSA) Conference in Washington, D.C.

On the panel with Clark was Army Gen. Xavier T. Brunson, Commander, United Nations Command, U.S. Forces Korea, and Tara Murphy Dougherty, Chief Executive Officer of Air, a leading AI software firm that specializes in national security readiness.

The two Army generals spent a good deal of their time talking about lessons learned from Ukraine and the benefits to the U.S. of allies – specifically in the Pacific. That struck me as something to further explore, since one day later, on Wednesday, President Trump continued his running criticism of allies with an October 14, Truth Social screed.

Trump said in part: “Because of the fact that we have had such Military Success, we no longer ‘need,’ or desire, the NATO Countries’ assistance — WE NEVER DID! Likewise, Japan, Australia, or South Korea. In fact, speaking as President of the United States of America, by far the Most Powerful Country Anywhere in the World, WE DO NOT NEED THE HELP OF ANYONE! Thank you for your attention to this matter. President DONALD J. TRUMP.”

On the other hand, Gen. Brunson had told the AUSA audience one day earlier, “Everything that we do is intricately woven around the ROK (Republic of Korea)-U.S. alliance. That alliance has stood for some 75 years and it is an example or a paragon, if you will, of all that's right when folk work in alliance together. The problems that we solve are joint problems. They're not just U.S. problems. They're not just Republic of Korea problems. What they are is great opportunities for two nations to work in concert with one another in order to arrive at solutions that are beneficial for both countries.”

Gen. Clark explained further, “So our ability to be able to work with partners and allies on their sovereign soil, to be able to share procedures that we build through [military] exercises over the course of a year, some joint, some army-to-army, but always integrated with our partners. It gives us the opportunity to have our systems work technically, to have our procedures nested, and to get to know one another in a way that allows us to build the trust that's necessary in training. Because if we wait until crisis or conflict, it's too late to ask the question, can I trust

you? But because we've been working together, because we've exercised at scale, because we're modernizing our forces alongside one another, it works.”

Clark added, “We've really worked hard at building those relationships at scale inside of the land forces. We have a land forces dialogue that meets multiple times a year -- chiefs of army of Australia, Japan, the Philippines, and the U.S. We've invited the ROKs in, we've invited India in, and it continues to grow. So those relationships built army-to-army are what allows us to really integrate across interoperability, and integrate it really across our formations and with our partners in all.”

Brunson described how he and Korean Gen. Kim Sung-min, Deputy Commander of the U.S.-ROK Combined Forces Command, discussed training differently “taking advantage of the knowledge that we have of the threats that exist or that prevail in the Ukraine fight.”

Brunson said, “We talk about how we would operate in a distributed fashion…Just imagine if we trained across the entirety of the [Korean] Peninsula and got ourselves in a shape where we would say you can't utilize the things that you've learned in the fight in the battlefield in Ukraine on us, because we learned the same lessons and we've distributed ourselves in such a way that we don't make ourselves the target. We won't be moored in place.”

Clark talked about Russia, North Korea and China “learning from watching us partner, but the partnerships that our adversaries have built are transactional versus the transformational relationships that we build as a security partner of choice globally…for us it's really transformational relationships that we look to cultivate with partners and allies over time.”

Brunson described how the North Koreans, fighting for the Russians in Ukraine were “able to test systems there…and then bring that back home. So, in one aspect, they've shortened their RDT&E cycle.” He also pointed out, “The fact that you have a combat trained force with recent

combat on the [Korean] Peninsula for the first time since 1953..[and] are now bringing those lessons learned back into their own training cycle, it's shortened their time to develop them.”

Clark said that U.S. forces had also learned from Ukraine about the need for mobility and camouflage, which he described as “age-old army forgotten sciences of how to hide in plain sight and how to camouflage ourselves from observation...Our ability to be able to use electronic warfare, to be able to use just good, old-fashioned camouflage and the ability to deceive our adversary is a must. In those two theaters [Ukraine and Iran] it's not a near-peer adversary that we would be working against -- whereas, in our theater [the Pacific] it absolutely is.”

For Clark, the questions were: “How do we fight, you know, Type One, Type Two UAS [unmanned aerial system, drones]; how do we think through ballistic missile defense holistically in the region. We spend a lot of time working again with the joint force for solutions associated with that. How do we maneuver?”

Brunson raised a new issue by pointing out that, “Our old system was something [a weapons system] breaks, we send it all the way back CONUS [Continental U.S.] in order to fix it so we can then bring it all the way back out again.” That used to take 29 days by ship.

However, he added, “In the ally that we have in Korea we have a an absolutely premier industrial base, if you look at the Korea defense industry, some of the kit that we're producing right now sits along our friends, allies and partners.” Brunson said, “The Army’s new infantry squad vehicle (ISV), for example, is produced by GM Defense and GM Defense is also in the Republic of Korea.”

“So the idea of a regional sustainment hub would simply be…to bring those means of production to the theater,” Brunson suggested, noting, “In the maritime domain, when we look at maintenance, repair, and overhaul, which is being done forward alongside the Koreans, you know that 15 percent of global ship building is done in Korea. And, oh by the way, we've got an ally with a mutual defense treaty in Japan that has 10% of global ship building. And if we take these cases forward, we're able to stay in theater longer.”

The answer, Brunson said, “We've got to try to achieve admirable endurance in theater by partnering alongside our allies, seeing the things that they can do better than we can right now at distance and then keeping them right where they belong. That keeps our [military] forces forward.”

Dougherty chipped in saying: “Tens of millions of dollars saved by simply identifying things like unfilled requisitions or parts that are obsolete that can be replaced with something not obsolete and also less expensive. I think that this is it. This is part of how you generate lethality. You get readiness to pay for itself, because otherwise sustainment is too expensive when it has to be done for the entirety of the joint force all the way on the other side of the world.”

At one point, Clark said, “The secret sauce for us as an Army is our Non-Commissioned Officer (NCO) corps, reflecting Defense Secretary Pete Hegseth’s September 30 speech praising the same group.

Clark noted that both he and Brunson were sons of NCOs, and that “with the assistance of our senior non-commissioned officers, senior enlisted leaders across the [PACOM] region have embarked upon conducting assessments with our partners and developing strategies to help them build their NCO development programs inside of their formations.”

To illustrate his point, Clark said his units had just finished an assessment in Cambodia of its army and the Commander, Gen. Mao Sophan, “basically said, ‘Hey, whatever you're asking us to do, we're going to do it because we want to get to a level of proficiency with our Non-Commissioned Officer core that we see in yours.’"

I must point out that during the one-hour-and-thirty-minute session neither General -- Clark nor Brunson -- came near to mentioning President Trump’s repeated critical views about U.S. allies.

The closest anyone came was Dougherty, who at one point said diplomatically, “We'll head into midterm elections here [in the U.S.] in November, obviously as you know, and I think we expect some variation in the political dynamic in the United States, and our allies and partners all navigate their own political changes as well.”

She then added, “If you look over the course of history, however, at least modern history, certainly the United States has invested in those partnerships. And today, we still are -- maybe with a different flavor or a different attitude. And that's not really for me to say. I'm simply observing. But we haven't lost sight of the importance of allies and partners to securing U.S. national interests.”

I would bet Clark and Brunson – along with most U.S. military professionals – would silently agree with her statement.

The Cipher Brief is committed to publishing a range of perspectives on national security issues submitted by deeply experienced national security professionals. Opinions expressed are those of the author and do not represent the views or opinions of The Cipher Brief.

Have a perspective to share based on your experience in the national security field? Send it to Editor@thecipherbrief.com for publication consideration.

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Why Extended Nuclear Deterrence Still Matters

Jennifer Lind and Daryl Press make a compelling argument in a recent article about the future willingness of the United States to provide extended nuclear deterrence, sometimes referred to as the “nuclear umbrella” to over 30 allies. Since the early days of the Cold War, the U.S. made a commitment to defend Europe against Soviet aggression, and under extreme conditions, included the use of nuclear weapons. Similar assurances were made to Japan, South Korea and Australia. The protection provided by this nuclear umbrella has been a hallmark of international order for decades as allies trusted the U.S. would protect them and therefore had no reason to develop their own nuclear weapon capabilities. Lind and Press rightly point out the security environment has changed dramatically, and the “order” created by the United States during the Cold War no longer exists. With the dissolution of the Soviet Union, Lind and Press argue Russia’s nuclear threat on a global scale is much diminished with Russia focused on its boundaries with eastern Europe and less concerned with “the global balance of power”. Similarly, Lind and Press view North Korea’s nuclear weapons development as a regional security issue with Kim Jong Un more interested in regime survival than peninsular conquest. They further argue conflicts today are largely regional in nature and question the commitment of the United States to engage in a nuclear conflict on behalf of an ally thousands of miles away. Thus, they claim the “nuclear umbrella” is broken.

The Nuclear Umbrella Still Exists

On the surface, it’s easy to believe this argument. The first Trump administration clearly stated an intent to put “America First” in 2017 and the second Trump administration signaled skepticism toward alliance commitments and their associated costs. Abroad, there is potential that this signaling from Washington also includes the commitment to extended nuclear deterrence. President Trump’s new National Security Strategy (NSS) published in 2025 does not mention extended nuclear deterrence or the nonproliferation of nuclear weapons. Similarly, the 2026 National Defense Strategy (NDS) does not “explicitly mention extended deterrence” and instead places the “primary responsibility” for their own defense on them with limited support from the U.S. And lastly, the current Trump administration has not and most likely will not issue a Nuclear Posture Review (NPR). The first NPR was released in 1994 every subsequent administration has issued one until President Trump took office again in 2024. The NPR is a blueprint which describes the role of nuclear weapons in U.S. security strategy. This document contains critical messaging on the capabilities, numbers, and modernization efforts of nuclear weapons and under what conditions the U.S. potentially would or would not use nuclear weapons. To be sure, the absence of explicit language on extended nuclear deterrence in the NSS and NDS and the lack of an NPR are departures from the U.S.’s historical stance providing nuclear top cover and nonproliferation of nuclear weapons.

Allies and partners of the U.S. have obviously taken notice and started conversations on how to proceed especially given continued Russian aggression, Chinese and North Korean nuclear weapons development, and what they might perceive as uncertainty of the U.S. as a nuclear deterrent backstop.

The United Kingdom and France recently pledged increased cooperation with nuclear weapons with the signing of the Northwood Declaration in 2025. French President Macron also rolled out a policy of “advanced deterrence” aimed at potentially providing nuclear forces to various European allies. Additionally, Japan, South Korea and Australia are all deeply concerned about nuclear weapons development in both China and North Korea. As a result from the proximate threat, some Japanese and South Korean officials have publicly discussed nuclear weapons, a topic previously considered taboo.

However, there is also plenty of evidence to support the fact that while the nuclear umbrella is bent and tattered, it’s not broken.

Although the current NSS and NDS do not explicitly mention extended nuclear deterrence, they do not explicitly eschew the notion either. In fact, the NDS states Europe should take “primary responsibility for its own conventional defense…” making a clear distinction between conventional and nuclear forces. Despite much talk of NATO needing to pull more of its own weight regarding security, the U.S. remains committed to the alliance. Since 1954, the U.S. pledged to protect NATO members and currently has around 100 air-delivered nuclear weapons deployed to various bases in Europe. In addressing the NATO Defense Ministerial, Under Secretary of War for Policy, Elbridge Colby, stated, “Thus, for the United States, our responsibility is to be clear, candid and consistent. We will continue to provide the U.S. extended nuclear deterrent.” Additionally, the U.S. continues to be active in the NATO Nuclear Planning Group, the senior policy body for NATO nuclear issues. Despite U.S. signaling a “scaling back” of conventional support to NATO, there is no plan to remove any of these nuclear weapons from Europe.

There are similar extended nuclear deterrence concerns from Japan and South Korea, especially the suggestion that both should take on more of the financial burden for their defense, the U.S. commitment to both is bit clearer. In February of last year, the U.S. Secretary of State met with the Foreign Minister of Japan and the Foreign Minister of the Republic of Korea to “reaffirm the unshakable trilateral partnership” between the three countries. This meeting underscored the historical commitment of the U.S. to the defense Japan and South Korea to include extended nuclear deterrence.

Why Extended Nuclear Deterrence Matters

What’s missing in many of the arguments concerning U.S. extended nuclear deterrence is how it has underwritten the concept of nuclear nonproliferation for decades. In 1968, the U.S. pledged cooperation in limiting the spread of nuclear technology as one of the first signatories of the Nuclear Non-Proliferation Treaty (NPT). Though limited and certainly not perfect, the Nuclear Nonproliferation Treaty (NPT) is widely considered one of the most successful arms control treaties ever written by limiting the spread of nuclear weapons while aiding risk reduction of nuclear weapons use. As mentioned earlier, dozens of countries have chosen not to pursue development of nuclear weapons (and pledged not do so as signatories of the NPT) because they determined the extended nuclear deterrent guarantee provided by the U.S. to be reliable and most importantly, credible. Additionally, any country who may feel abandoned by the nuclear umbrella provided by the U.S. and may choose to pursue development of their own nuclear weapon faces myriad challenges. First, many are bound by the NPT and even if they were not, often lack the resources to develop nuclear weapons and delivery systems. Second, all states, even those with the technical know-how to proceed with a nuclear weapons program, would introduce into the nuclear “club” another independent launch authority, more command-and-control systems with varying levels of capability, unknown decision-making processes during crises, and more opportunities for proliferation, miscalculation, and accidents. Following the bombing of Hiroshima and Nagasaki, the one thing the international community could agree upon was developing a strong prohibition against the use of nuclear weapons. Many resolved crises throughout history where nuclear weapons loomed in the background reinforced the idea that the use of nuclear weapons was unthinkable. The spread of nuclear weapons to more independent states does not simply mean we live in a world with more of them, it substantially increases the number of situations where they become increasingly integrated into routine statecraft and thus, their potential use more thinkable.

The Strategic Consequences

Despite concerns about the credibility of U.S. extended nuclear deterrence that have emerged in some allied capitals, the United States should not become resigned to the prospect of allies leaving the nuclear umbrella. Doing so would weaken the nonproliferation regime, increase incentives for independent nuclear programs, and ultimately leave the United States confronting a more dangerous strategic environment. The U.S. should continue to signal that the credibility of extended nuclear deterrence rests upon strong conventional capabilities and even stronger, unmistakable political resolve with our allies while keeping nuclear use as the final safeguard. Increased proliferation of nuclear weapons does not achieve that objective.

The United States is unique among states that possess nuclear weapons because it has used the world’s most capable nuclear weapons arsenal to prevent nuclear proliferation rather than encourage it. Thus, extended nuclear deterrence and nuclear nonproliferation are inseparable. The enduring contribution to international security by the United States has been and should continue to be the guarantee of nuclear extended deterrence to uphold nonproliferation and preserve the longstanding objective of nuclear non-use.

In no uncertain terms should the U.S. become “comfortable” with more states acquiring their own nuclear weapons resulting from of a lack of confidence that Washington will continue to be the nuclear guarantor. Despite periodic political signals that make some allies nervous, Washington has been remarkably consistent, across multiple administrations, in its policy toward extended nuclear deterrence. States that question U.S. commitment should consider whether other alternatives would enhance their security. The answer is almost certainly no.

The views expressed here are those of the author alone and do not necessarily represent the views, policies, or positions of the U.S. Department of Defense or its components, to include the Department of the Navy or the U.S. Naval War College.

The Cipher Brief is committed to publishing a range of perspectives on national security issues submitted by deeply experienced national security professionals. Opinions expressed are those of the author and do not represent the views or opinions of The Cipher Brief.

Have a perspective to share based on your experience in the national security field? Send it to Editor@thecipherbrief.com for publication consideration.

Read more expert-driven national security insights, perspective and analysis in The Cipher Brief