Korea faces new US demands in overhaul of military alliance

The national flags of Korea and the United States are displayed side by side during a rotation ceremony for U.S. Forces Korea at Camp Casey in Dongducheon, Gyeonggi Province, June 18. Yonhap

As a crucial Aug. 1 deadline looms, Korea and the United States are racing to finalize a sprawling package deal encompassing tariffs and security. The high-stakes negotiations are intensifying scrutiny on how Washington's far-reaching demands concerning defense and regional stability will ultimately shape the agreement.

The negotiations may include pressure on Seoul to increase its defense spending and take on a larger role in countering China, both of which align with U.S. President Donald Trump's explicit demands of American allies in Asia.

Since President Lee Jae Myung took office on June 4, U.S. officials have repeatedly emphasized the need to modernize the bilateral alliance on defense and security cooperation.

The term was notably used by Secretary of State Marco Rubio in a congratulatory message on Lee’s inauguration, when he said, "We are also modernizing the alliance to meet the demands of today’s strategic environment and address new economic challenges."

The idea was highlighted again during a visit to Seoul by Kevin Kim, U.S. deputy assistant secretary of state for China, Japan, Korea, Mongolia, and Taiwan, on July 10. Alliance modernization was a key item on the agenda in his meeting with his counterpart, Hong Ji-pyo, director-general for North American affairs at Korea's Ministry of Foreign Affairs.

When asked to clarify what the term specifically entails, a foreign ministry official said the government will "continue to consult and cooperate closely with the U.S. to develop the alliance into a future-oriented, comprehensive strategic partnership capable of responding to the evolving economic and security environment," but declined to offer further details.

The exact scope of modernization remains unclear, but many see it as a demand for allies to take on a bigger share of the security burden, a policy priority for Trump.

That could include raising Korea's defense spending, potentially up to 5 percent of gross domesic product, and expanding the role of U.S. Forces Korea (USFK) in potential military conflict involving Taiwan.

Recent developments in U.S.-Philippines ties may offer a preview of Washington's expectations.

On Monday, U.S. Defense Secretary Pete Hegseth hosted Philippine President Ferdinand Marcos Jr. at the Pentagon, just days before the U.S. and Philippines finalized a tariff agreement.

During the meeting, Hegseth said the U.S.-Philippines Mutual Defense Treaty now "extends to armed attacks on our armed forces, aircraft or public vessels, including our Coast Guard, anywhere in the Pacific, including the South China Sea."

He also emphasized the strategic importance of Manila’s geographic position, signaling a broader U.S. effort to strengthen security partnerships in Asia.

Korea's First Vice Foreign Minister Park Yoon-joo, right, U.S. Deputy Secretary of State Christopher Landau, left, and Japanese Vice Foreign Minister Takehiro Funakoshi hold a three-way meeting in Tokyo, July 18. Yonhap

It is widely anticipated that similar demands will be directed at Korea, in line with Trump’s regional strategy in Asia.

The Chosun Ilbo reported Thursday that Washington has already urged Seoul to expand the scope of the 1953 Mutual Defense Treaty to align more closely with Washington's Indo-Pacific strategy. According to the report, U.S. Deputy Secretary of State Christopher Landau made the request during a meeting with First Vice Foreign Minister Park Yoon-joo in Tokyo last Friday.

The foreign ministry denied that the request was made during the meeting.

These issues are expected to be among the top priorities for Foreign Minister Cho Hyun, who officially took office on Monday. According to diplomatic sources, he is seeking to visit Washington as early as next week. Cho has yet to hold a phone call with his U.S. counterpart and is widely expected to travel without prior contact.

The top diplomat's potential visit comes as allies gear up for last-minute tariff negotiations, though progress seems to be stalled.

A high-level trade dialogue scheduled for Friday was abruptly postponed after the U.S. canceled the meeting, citing Treasury Secretary Scott Bessent's urgent schedule.

The meeting was set to bring together Finance Minister Koo Yun-cheol and Trade Minister Yeo Han-koo with Bessent and U.S. Trade Representative Jamieson Greer.