The United States has canceled a joint amphibious landing exercise with South Korean forces that was set for next month, citing resource constraints driven by the war in Iran, the South Korean military announced Monday. The U.S. Marine Corps had notified its South Korean counterpart in June that Middle East operational demands would prevent the deployment of forces for the biennial exercise known as Ssangyong, or "Twin Dragons," the South Korean Marine Corps said on Monday.

The move marked the second joint military drill with South Korea to be canceled or downsized during President Trump's second term. The decision has intensified doubts over Washington's commitment to maintaining a credible deterrent on the Korean Peninsula and its capacity to manage concurrent global conflicts, as U.S. weapons stockpiles have fallen to troubling levels.

Ssangyong is one of the highest-profile joint exercises that the allies have conducted for decades. In a typical iteration, more than 10,000 Marines from both countries storm a sandy beach on the southeastern coast of South Korea, supported by columns of amphibious vehicles and fleets of military aircraft. North Korea has routinely condemned the drill as a rehearsal for invasion.

While Ssangyong was previously shelved during Mr. Trump's first term, it was revived in 2023. Mr. Trump recently renewed his criticism of the drills, labeling them "insulting" to Kim Jong-un. Earlier this month, he abruptly ordered the Pentagon to curtail the Ulchi Freedom Shield, shortening the 11-day annual exercise to just five days.