The United States has begun a large military exercise with South Korea involving thousands of troops while also waging an escalating war in the Middle East.

The United States began a large military exercise with South Korea involving thousands of troops Monday while also waging an escalating war in the Middle East.

South Korea’s Joint Chiefs of Staff has said about 18,000 Korean troops will take part in Freedom Shield, which runs through March 19. U.S. Forces Korea hasn’t confirmed the number of American troops participating in the training in South Korea.

The allies’ combined exercise comes amid South Korean media speculation that Washington is relocating some assets from South Korea to support fighting against Iran.