The United States has canceled a major joint amphibious military exercise with South Korea scheduled for next month, citing resource constraints linked to ongoing military operations in Iran, South Korea’s military said Monday.

The U.S. Marine Corps informed its South Korean counterpart in June that operational demands in the Middle East would prevent American forces from participating in the biennial exercise known as Ssangyong, or “Twin Dragons,” according to the South Korean Marine Corps.

The U.S. military command in South Korea did not immediately comment on the announcement.

The cancellation marks the latest adjustment to joint U.S.-South Korean military exercises during President Donald Trump’s second term. Another major exercise was recently scaled back, raising questions about Washington’s ability to maintain military readiness on the Korean Peninsula while managing simultaneous security challenges elsewhere.

Concerns have also grown over pressure on U.S. weapons stockpiles as American forces respond to multiple global conflicts.

Ssangyong is one of the most prominent military exercises conducted by the United States and South Korea. During previous drills, more than 10,000 Marines from both countries have participated in large-scale amphibious landings along South Korea’s southeastern coast, supported by military aircraft and amphibious vehicles.

The exercises are designed to strengthen interoperability and preparedness between the two allies in the event of a conflict on the Korean Peninsula.

North Korea has repeatedly condemned Ssangyong and other U.S.-South Korean military exercises, describing them as rehearsals for an invasion.

The cancellation comes amid broader questions about the impact of U.S. military commitments in the Middle East on Washington’s ability to maintain forces and equipment across other strategically important regions.