South Korea's air force says the drill involved a B-52 bomber from the United States and fighter jets from South Korea and Japan.
Carlos Del Toro said Friday that the major multination military training exercise launched in Australia sends a message to China.
The United States and South Korea also launched separate bilateral drills on Monday that will continue through April 28.
U.S. and French troops who are in Romania as part of a NATO battlegroup held a military exercise to test the alliance’s eastern flank defenses.
