The Unraveling of a 70-Year Alliance: Why Trump Is Pivoting From South Korea to North Korea

The Unraveling of a 70-Year Alliance: Why Trump Is Pivoting From South Korea to North Korea

 

On the evening of August 16, 2026, President Donald Trump posted to Truth Social that he had instructed Defense Secretary Pete Hegseth to "substantially reduce" joint U.S.-South Korea military exercises, hours before Ulchi Freedom Shield 2026 was to begin. He offered two reasons: his "very good relationship" with North Korean leader Kim Jong Un, and Seoul's refusal to join the American war against Iran. A seven-decade commitment to the U.S. position in East Asia fell to the president's personal diplomacy and his grievances with an ally, all in one social media post.

The Announcement: An Order Too Late to Cancel

The order could not be implemented as written. The exercises began on August 17 as scheduled, with about 18,000 South Korean troops taking part in Ulchi Freedom Shield, an 11-day exercise through August 27. Washington and Seoul have held joint exercises since 1955, and U.S. troops have remained on the peninsula since the armistice that left the Koreas technically at war.

Trump opened his post "based on my very good relationship with Kim Jong Un," saying "not happy with the fact that the United States has, long ago, agreed to participate in Joint Military Exercises with South Korea." He called the drills "not only costly," a "signal that is totally inappropriate and hostile" to a country he described as "unthreatening and respectful." Since "it is too late to cancel," he had instructed "Secretary of War, Pete Hegseth, to substantially reduce the Joint Military Exercises!"

The Pentagon initially said it had "no changes to announce regarding Ulchi Freedom Shield 2026 at this time," then said it was "actively working on executing" the president's directive. South Korea's defense ministry said it was "proceeding as planned."

Ulchi Freedom Shield 2026 at a Glance	Detail
Start date	August 17, 2026
Duration	11 days, through August 27 (some reports cite 10 days)
South Korean participation	About 18,000 troops
U.S. troop presence	About 28,500 stationed in South Korea; Trump cited "39,000 soldiers" in his Oval Office remarks
Field exercises planned	14 battalion-level or larger, down from 17 in 2025
Focus areas	Drone warfare, GPS jamming, cyberattacks; lessons from North Korea's battlefield experience in Ukraine; live-fire precision targeting and wet gap crossing
Institutional purpose	Assess capabilities for the wartime operational control (OPCON) transition
Trump's directive	"Substantially reduce" U.S. participation, posted hours before the start

The practical effect remains unclear, but the allies had already trimmed the scale, from 17 battalion-level or larger field exercises in 2025 to 14 in 2026. The drills incorporate live-fire precision targeting, wet gap crossing, and prepositioned equipment.

The Double Motivation: Kim and Iran

Trump's post had two motives, the first personal. The day before the order he posted a 2019 photograph of himself and Kim at Panmunjom, writing that they "get along great." In the Oval Office he said, "Kim Jong Un has always treated me with great respect. I understand him. He understands me," and insisted the cut made things "safer, just the opposite."

Asked whether Kim had responded to his overtures, Trump said: "How do you know he hasn't responded?" Pressed, he answered: "Yes, he has." He described the interaction as "very positive" but gave no details. South Korea's unification ministry could not confirm any communication, and North Korean state media had not acknowledged the overtures.

The second motive was transactional:

"While somewhat unrelated (?), I recently asked the President of South Korea if they would like to join us in the Denuclearization of the Islamic Republic of Iran, and they said, 'No thanks!'"
Donald Trump, Truth Social post, August 16, 2026

The parenthetical "somewhat unrelated (?)" is revealing: Trump noted the gap between cutting exercises and punishing Seoul for refusing a Middle East war, then connected them anyway. In the Oval Office he made the link explicit:

"We have 39,000 soldiers over there guarding you from Kim Jong Un, your next door neighbour, and you're not going to help us on a very easy military operation in Iran. That's strange."
Donald Trump, remarks to reporters in the Oval Office, August 17, 2026

"All I want is fairness," he added, claiming South Korea used to pay $3 billion a year toward U.S. Forces Korea until the Biden administration rescinded it. The gap between the 39,000 soldiers Trump cited and the roughly 28,500 actually stationed there showed how little of the decision had to do with the alliance's actual details.

Why 2026 Is Not 2018

Trump's framing of North Korea as "unthreatening and respectful" contradicts the record below. Pyongyang's Foreign Ministry called the exercises "a rehearsal for an aggressive war," vowing a response at "a new level of a deterrent." Kim Yo Jong said last year that her brother's relationship with Trump was "not bad," but that any attempt to use it to end the nuclear program would become the subject of "mockery." Kim himself said he could resume talks only if Washington drops "its delusional obsession with denuclearization," while Russia's foreign minister told Pyongyang the two countries are building a "new and righteous world order."

Measure	2018 (First Summit Era)	2026
Nuclear arsenal	Then-nascent program	Estimated 60 nuclear warheads (Arms Control Association)
Missile stockpile	Limited	Estimated 120 ballistic missiles (KEIA)
Testing since Trump returned to office	Not applicable	24 ballistic missile tests; two launches since August 6
Russia alignment	Limited, sanctions-era ties	June 2024 comprehensive strategic partnership; more than 14,000 troops deployed to Ukraine; Zelenskyy warns 30,000 more planned
Battlefield experience	None	Troops fighting in Ukraine; missiles reportedly 300 times more accurate with Russian technology
Kim's bargaining position	Needed a summit with the U.S. president	Russia and China aligned; state media silent on Trump's overtures; talks offered only if the U.S. drops "its delusional obsession with denuclearization"

The Fallout: Seoul, Washington, and the Region

South Korea's public response was measured but pointed. The presidential office hoped the "friendly relationship" between Trump and Kim would lead to "meaningful dialogue," while insisting the exercises did not reflect "any intention to attack North Korea or escalate tensions." President Lee Jae Myung said the country should proceed with the wartime operational control (OPCON) transfer without disruption, the authority to direct South Korean forces which has rested with an American four-star general since the Korean War:

"A strong alliance makes the foundation of security stronger, and strengthening our own capabilities increases our value and necessity as an ally."
Lee Jae Myung, President of South Korea

Lee also called for faster progress on South Korea's nuclear-powered submarine program. The transfer was to be assessed during the very exercises Trump ordered cut back, putting it at risk. The conservative opposition People Power Party accused Lee of "turning a blind eye on the public's security concerns."

The Chosun Ilbo asked whether the alliance's foundation had been reduced to a bargaining chip. The Korea Times wrote that linking the alliance to cost and the Iran war "comes across as transactional and disrespectful," since the alliance "has long been the linchpin of U.S. strategy in Asia." The Korea JoongAng Daily argued that "dialogue and joint military exercises are not mutually exclusive. Credible deterrence is necessary even for diplomacy."

In Washington, reactions were critical. Senator Mark Kelly of Arizona, an Armed Services member, called the announcement "shortsighted and a mistake," noting that "North and South Korea are still technically at war." Senator Andy Kim of New Jersey said such decisions "need to be made jointly," not "announced unilaterally by social media." Retired Admiral Mark Montgomery said the move "lowers coalition readiness and puts US forces at risk with no real tangible benefit to the United States," and Zack Cooper of the American Enterprise Institute warned it would "undermine Seoul's confidence in Washington, which will raise the prospects of South Korea acquiring an independent nuclear capability."

Japan's defense minister, Shinjiro Koizumi, called trilateral cooperation among Japan, the U.S., and South Korea "critical to the peace and stability of the region." Australia's defense minister expressed concern about North Korea's nuclear and missile programs, Taiwan's president pledged to raise defense spending to 5% of GDP by 2030, and China's foreign ministry said a peaceful and stable peninsula is "in the interest of all parties."

The Cost of a Bargaining Chip

Trump's cost math doesn't work. When he canceled a joint exercise in 2018, a Pentagon spokesman put the price at $14 million; adjusted for inflation, about $18.6 million. Hegseth has asked Congress for $37.5 billion to cover the Iran war so far. Exercises are not the expensive item on the ledger.

"The cost savings from downsizing drills are marginal, while the diplomatic benefits for relations with North Korea are doubtful."
Leif-Eric Easley, Professor at Ewha University in Seoul

Most of the money for this year's exercise was already committed. Carl Schuster, a former director of the U.S. Pacific Command Joint Intelligence Center, noted that curtailed training will have to be made up elsewhere, or readiness suffers. The drills rehearse the command relationships, intelligence flows, and logistics that let two national militaries fight as one. Colonel Ryan Donald, a Combined Forces Command spokesman, said: "They've taken those lessons they learned there and brought them back to North Korea, that changes the DPRK capability."

The OPCON question compounds the cost. The last-minute cut complicates the capabilities assessment needed for the conditions-based OPCON transfer, a project Washington has encouraged, just as the 2026 National Defense Strategy assigns South Korea "primary responsibility" for deterring North Korea with "critical but more limited" U.S. support.

The cut came as the U.S. Navy pulled its only Western Pacific-based carrier, the USS George Washington, toward Iran to relieve the USS Abraham Lincoln, which had gone over 200 days without a port call. The redeployment left no American carrier in the Asia-Pacific for the first time since 1944, and interceptors had earlier been moved from the peninsula to the Middle East. "This is what the end of an era looks like," wrote Phillips O'Brien, professor of strategic studies at the University of St. Andrews.

The Case for the Cut

The decision also had its defenders. Defense Priorities, a Washington think tank, called the reduction "necessary and strategically wise." Jennifer Kavanagh, its director of military analysis, said bilateral exercises "unnecessarily burn US resources and readiness at a time when the United States is running low on both," and the group argued there is "little evidence" that exercises deter North Korea and China, stabilize the region, or prepare both militaries to operate together. U.S.-led drills, it said, provoke Beijing and Pyongyang into their own buildups and test launches. Sydney Seiler, a former U.S. National Intelligence Officer for North Korea, recalled that the 2018 suspension "didn't gain us that much at the time, but I don't think we lost that much at the time either."

Rob Rapson, a former acting U.S. ambassador to South Korea, expects limited short-term impact on readiness and cites the 2018 precedent. But Lim Eul-chul of Kyungnam University noted that Pyongyang "will only view it as meaningful if the joint exercises are canceled in their entirety rather than scaled back."

What Comes Next: The Precedent

The question is what Kim will pay for a concession granted in advance. Victor Cha of the Center for Strategic and International Studies called the scaling down "a concrete action rather than just words and social media posts," but expects Pyongyang to "bide their time and wait a little bit." Andrew Yeo of the Brookings Institution sees a meeting as still possible: for Kim, "it's really about reputation. It's about meeting with the U.S. president again," even though the U.S. and South Korean militaries "would have probably preferred not to use joint exercises as a bargaining chip to restart diplomacy."

Emma Chanlett-Avery of the Asia Society Policy Institute said Kim has little appetite for negotiations given his increased influence, and Frank Jannuzi of the Mansfield Foundation predicted Pyongyang will play hard to get: if Trump is serious, "he's going to have to come bearing gifts."

Other allies are hedging. Denmark chose Franco-Italian air defense over the U.S. Patriot system, Canada is re-evaluating its F-35 commitment, the Dutch central bank moved cloud infrastructure from U.S. to European providers, and Saudi Arabia, Turkey, and Pakistan signed a NATO-style defense pact on August 7. The Korea JoongAng Daily editorial board urged Seoul to expand security cooperation with Japan and trilateral cooperation with Washington.

None of this means the alliance is dissolving. It means allies can no longer count on predictability, the trait they rely on most. Trump has set a precedent: he can invoke, suspend, or reduce alliance obligations in a social media post hours before the activity, conditioned on unrelated wars, and weighted against a relationship with an adversary. The 2018 suspension was a concession after a summit, part of a visible diplomatic process. The 2026 reduction is a concession in advance. There is no verified channel to Pyongyang, no summit scheduled, and no sign from North Korean state media that the gesture is being registered.

Alliances depend on the expectation that commitments will be honored. Trump's Truth Social post broke that expectation in a single message. Pyongyang's silence, expanding Russian ties, and continued missile testing suggest Kim has no intention of responding to the concession.