Thousands of allied American and Filipino forces have opened annual combat drills that will include simulating the defense of the Philippines.
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.
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