U.S. pressure over Korea’s possible role in the Iran war is complicating Seoul’s pending talks with Washington, including a $350 billion investment commitment and nuclear-powered submarine discussions. President Lee Jae Myung said nothing has been decided on troop deployment, while Washington has said it is still waiting for Korea to commit resources. Separate pressure is also building over semiconductor tariffs and chip plant investment in the U.S.

Civic groups hold a press conference in front of Cheong Wa Dae in Seoul, Monday, to protest the possible deployment of Korean troops to the Strait of Hormuz. Yonhap

Korea is facing an increasingly complicated task as it seeks to address a series of pending issues with the United States, as U.S. pressure for it to participate in the Iran war intertwines security and diplomatic challenges with economic and trade interests.

While participating in the war in any form is not an easy decision for Korea to make, the growing pressure is effectively preventing progress in other major bilateral issues, including Korea's $350 billion investment commitment in the U.S. and its pursuit of domestically developed nuclear-powered submarines.

U.S. President Donald Trump has repeatedly expressed frustration over Korea's reluctance to provide military support for the U.S. war on Iran. In a Fox News interview late last month he claimed that Seoul had turned down his request for help in the war and warned that he would "remember that."