The U.S. military sent a B-1B strategic bomber from Guam over the Korean Peninsula on Wednesday for a massive joint exercise with the South Korean Air Force this week, the U.S. Pacific Air Forces said amid heightened tensions with nuclear-armed North Korea.

The Pacific Air Forces said the B-1B took off from Andersen Air Force Base on Guam, meeting two Air Self-Defense Force F-15 fighters for bilateral drills in airspace near the Kyushu region before heading to the Korean Peninsula.

There, "the bomber participated in an air power demonstration during the ninth iteration of the annual Vigilant Ace exercise," the U.S. Pacific Air Forces said. It was joined by a total of six of the United States' most advanced stealth aircraft as well as South Korean fighter jets.