US Forces Korea Chief Proposes Allied Kill Web to Counter China and North Korea

A Network Connecting Seoul, Tokyo and Manila

U.S. Army Gen. Xavier Brunson, commander of U.S. Forces Korea, has proposed connecting the military capabilities of South Korea, Japan and potentially the Philippines into a "kill web" as Washington confronts the possibility of simultaneous conflicts involving China and North Korea. The proposal, described in a recent interview, would bring together forces operating across land, sea, air, space, cyberspace and the electromagnetic spectrum.

Brunson also leads the United Nations Command and Combined Forces Command. His three commands place him at the intersection of American, multinational and combined military responsibilities on the Korean Peninsula. His proposal would move cooperation beyond separate U.S. alliances toward a framework linking several regional allies.

A kill web connects sensors, weapons and command centres so that information collected by one part of the force can help another respond. A sensor detects a threat, a command centre assesses it, and a weapon system can act on the shared information. Brunson's concept would allow those connections to cross national and military service boundaries, supporting the sharing of targeting data and coordinated strikes in real time.

Brunson explained that the allies already possess capabilities that complement one another, but need to connect them to produce a coordinated military effect.

We have to link these complementary capabilities into a kill web that achieves combined, joint, all-domain effects.

In military language, "combined" means forces from more than one country, while "joint" means different military services working together. "All-domain" extends that cooperation beyond land, sea and air to space, cyber operations and the electromagnetic environment, where communications and other electronic systems operate.

The ambition is a unified defensive network rather than separate military structures operating near one another. South Korea and Japan would be central to the proposal, with Philippine participation potentially extending its reach farther south.

Why Planners Are Looking Toward 2030

China's and North Korea's expanding military capabilities form the immediate strategic setting for Brunson's proposal. Both are modernising their nuclear forces, while improvements in conventional weapons are making potential regional conflicts more complicated for the United States and its allies.

The Atlantic Council's analysis suggests that by 2030, Washington is likely to face operational challenges in the Indo-Pacific substantially more complex than those it faces today. China is improving the amphibious forces used to move troops from sea to land, alongside its air power and strike capabilities. Those developments would strengthen its ability to project force against Taiwan and surrounding areas.

China is also assessed as likely to approach near-peer status with the United States in strategic nuclear capabilities by 2030. Strategic nuclear weapons are those associated with attacking major targets and deterring another nuclear power. A closer balance between Beijing and Washington would complicate decisions during a conventional conflict that carries the risk of nuclear escalation.

North Korea, meanwhile, is expected to field a wider range of precise weapons without nuclear warheads, alongside a substantial and increasingly mobile tactical nuclear missile force. Tactical nuclear weapons are intended for use in a military conflict, including against forces or military facilities. Mobility makes launchers harder to locate and follow.

The projected North Korean arsenal includes weapons capable of threatening targets across the region and the continental United States. Together, these developments create a nuclear threat from two directions, alongside the possibility that Washington could be required to manage more than one crisis or war at the same time.

What Guardian Tiger Tested

The Atlantic Council's Indo-Pacific Security Initiative, with support from the Defense Threat Reduction Agency, conducted tabletop exercises called Guardian Tiger I and II. These exercises explored scenarios set in 2030 involving simultaneous confrontations around the Korean Peninsula and Taiwan, with the possibility of limited nuclear use complicating military and political choices.

U.S. government officials, military officers and nongovernmental experts participated in the exercises. They were organised into teams representing national leadership, military commands and adversary groups playing China and North Korea. A tabletop exercise uses a developing scenario to test how participants make decisions and how those decisions affect other actors.

Guardian Tiger exposed gaps in existing mechanisms for alliance coordination. Participants faced the difficulty of managing two major conflicts simultaneously without integrated command structures. The problem extended beyond the availability of weapons or troops to the way governments and commanders shared information, assigned responsibilities and agreed on responses.

One scenario began with North Korean attacks on South Korean military forces in the Yellow Sea and the Northwest Islands. The confrontation escalated to chemical weapons strikes and tactical nuclear demonstrations. It illustrated how an initially limited clash could become a much larger confrontation involving weapons of mass destruction.

Another scenario began with Chinese aggression against Taiwan and expanded through missile strikes on U.S. bases in Japan and Okinawa. North Korea then applied pressure on South Korea to force American troops out of the peninsula. Together, the scenarios showed how a conflict in one location could spread across the region and acquire a nuclear dimension.

These were simulated pathways used to examine decisions in a possible future conflict. Their operational lessons help explain the kind of coordination problem that Brunson's proposed network seeks to address.

How Two Conflicts Could Pull Alliances Apart

China and North Korea created overlapping pressures during the Taiwan scenario. Chinese forces established maritime exclusion zones, restricting access to areas of sea, and struck U.S. facilities in Japan. Beijing also warned South Korea against allowing U.S. Forces Korea to support operations involving Taiwan.

North Korea simultaneously pursued a campaign intended to separate Seoul from Washington. It launched cyberattacks against military networks and used strategic messaging to demand the withdrawal of American troops. The combination put pressure on both the forces conducting operations and the political relationships that supported them.

Separate alliances gave each partner an established relationship with the United States, but the exercise exposed difficulties in bringing those relationships together during simultaneous threats. Fragmented command structures and insufficient arrangements for sharing intelligence in real time made coordinated action harder when China and North Korea acted together or took advantage of one another's moves.

South Korean participants also faced decisions about acting without Washington. In one scenario, South Korean forces independently struck North Korean targets after perceiving U.S. hesitation. The exercise showed how Seoul might act unilaterally if it considered Washington too cautious or distracted by another commitment.

Japanese forces carried out counterstrikes against Chinese missile sites that were attacking U.S. bases. Those actions demonstrated allied military capabilities, while also exposing the danger that separate responses could drive escalation without strong mechanisms for joint coordination.

Brunson's proposed connections between allied sensors and weapons would support a shared picture of events and coordinated responses. During a limited nuclear attack, rapid communication would be especially important for identifying who carried it out, assessing the situation and deciding how to respond while allies faced threats from different directions.

Why North Korean Escalation Requires a Different Response

North Korea's behaviour in Guardian Tiger centred on vertical escalation. This means increasing the severity of a conflict, particularly by moving from conventional attacks toward chemical or nuclear weapons. The exercises included early and repeated threats to use tactical nuclear weapons.

Pyongyang could seek to deter outside intervention through nuclear strikes of relatively low explosive yield against military targets. Such a move would create immediate pressure on allied leaders to decide whether and how to respond, while the wider conflict continued.

The scenarios also included the possibility that North Korea would delegate nuclear launch authority to field commanders in advance. That arrangement could allow nuclear use without direct approval from the capital at the moment of launch, increasing the speed at which a confrontation might escalate.

Allied deterrent messages would need to be coordinated under those conditions. Deterrence means trying to prevent an opponent from taking an action by making the expected costs clear. If different allies sent conflicting signals during a nuclear crisis, commanders would face an even more difficult task in managing the confrontation.

The exercises identified a risk of rapid nuclear exchange if the allies could not coordinate their messages and response decisions effectively. North Korean nuclear threats would demand immediate attention, including consideration of potential nuclear responses, while conventional military operations continued elsewhere.

How China Could Spread a Conflict Across the Region

China's simulated approach relied more heavily on horizontal escalation. Instead of primarily increasing the destructive force used in one place, horizontal escalation spreads a conflict into additional geographic areas or types of military activity.

During the Taiwan scenarios, Chinese forces expanded operations through cyberattacks against regional infrastructure, actions in space targeting U.S. satellites, and strikes against Japanese bases supporting American operations. Beijing also threatened economic warfare and established exclusion zones in the Yellow Sea to pressure South Korea.

Those measures sought to disrupt Washington's ability to sustain operations without immediately triggering nuclear responses. The pressure could reach communications, infrastructure, military bases and maritime access at the same time, forcing commanders to manage several connected problems.

China's horizontal expansion and North Korea's vertical escalation would place different demands on the same allied command systems. North Korean nuclear threats would require urgent decisions, while Chinese conventional aggression would require sustained operations across air, maritime and cyber environments.

Brunson's kill web is intended to provide connections that help allied forces process those simultaneous challenges. Its purpose would be to support an appropriate response to North Korean nuclear threats while maintaining pressure against Chinese conventional operations.

South Korea and Japan would also view the danger from different geographic positions. Seoul would focus intensely on North Korean escalation, while Tokyo would confront Chinese expansion across its maritime approaches. Coordinated networking would seek to align those perspectives so that an ally responding to its most immediate threat did not leave another more exposed.

What the Philippines Would Bring

The Philippines would extend the proposed network beyond Northeast Asia. Manila has a Mutual Defense Treaty with Washington, and its geographic position provides basing options and maritime awareness in the South China Sea that could matter during either a Korean or Taiwan contingency.

Philippine participation could connect those capabilities with the forces and information networks of South Korea, Japan and the United States. Extending coverage southward would give the proposed defensive architecture a broader reach across the Western Pacific.

Brunson's concept therefore moves from cooperation involving Seoul and Tokyo toward the possibility of a framework also including Manila. Philippine involvement remains a potential part of the proposal, rather than an announced operational arrangement. No implementation date was given.

The wider concept is presented as a response to threats from North Korea, China and Russia. The operational scenarios described in Guardian Tiger focused on China and North Korea, particularly the demands their simultaneous actions could place on Washington and its allies.

Why Command Arrangements Matter

U.S. Forces Korea currently operates within a structure focused primarily on defending the Korean Peninsula. U.S. Forces Japan manages a separate bilateral relationship with Tokyo. Brunson's proposed integration would require mechanisms for operational coordination across those established boundaries.

These command arrangements have remained largely static since the Cold War. Connecting military equipment would be one part of the task, but commanders would also need ways to plan together and coordinate activities across different national and organisational responsibilities.

Guardian Tiger's analysis recommended updating the Unified Command Plan, the framework that assigns responsibilities among U.S. military commands. The aim would be greater capacity for coordination at the operational level, both between two countries and among several countries in East Asia.

One possible reform was a new joint warfighting command under U.S. Indo-Pacific Command that could coordinate activities across Korea and Japan simultaneously. Such a command would address limitations created by the separation between U.S. Forces Korea and U.S. Forces Japan, particularly in planning involving Washington, Seoul and Tokyo.

Those recommendations concern the organisation of command as well as the movement of information. A regional network would need commanders to connect shared intelligence with coordinated decisions about forces operating in more than one area.

An East-Up Map and a Broader View of Korea

Brunson has also begun shifting strategic perspectives within his commands through an "east-up" map orientation. Placing east at the top presents South Korea within a broader Indo-Pacific setting, rather than treating the peninsula as the central focus of the map.

The change symbolises a wider doctrinal shift from a defensive posture centred on the 38th parallel toward a regional framework that includes the East China Sea and South China Sea. It encourages military planners to consider how events around Korea connect with operations elsewhere in the Western Pacific.

Brunson's simultaneous leadership of U.S. Forces Korea, the United Nations Command and Combined Forces Command gives him a position from which to pursue those connections. The commands reflect the distinct American, multinational and combined dimensions of security on the peninsula.

The United Nations Command offers a multinational framework that could potentially support broader regional coordination beyond its traditional focus on Korea. Brunson's approach seeks to use existing command authorities while advocating new networking capabilities, connecting present alliance structures with the demands of a more integrated regional defence.

As of April 28, 2026, the central proposal is to link complementary allied capabilities so that separate forces can understand and respond to a shared crisis together. Guardian Tiger supplies a detailed picture of the problem: China and North Korea could apply different forms of pressure at the same time, while allies make urgent decisions through command arrangements built largely around separate relationships with Washington.

The Bottom Line

• Gen. Xavier Brunson proposes a kill web connecting South Korean and Japanese military capabilities, with potential Philippine participation, to address threats from North Korea, China and Russia.
• The network would link sensors, weapons and commanders across land, sea, air, space, cyberspace and the electromagnetic spectrum.
• Guardian Tiger I and II examined scenarios set in 2030 involving simultaneous conflicts around Korea and Taiwan, including the risk of limited nuclear use.
• The exercises exposed gaps in intelligence sharing, joint planning and coordination across separate U.S. alliances.
• North Korea's simulated escalation relied on early nuclear threats, while China spread pressure across geographic areas and military domains.
• Recommended command reforms included updating the Unified Command Plan and potentially creating a joint warfighting command under U.S. Indo-Pacific Command.
• Philippine participation could extend the network into the South China Sea. No implementation date was given.