WASHINGTON (Reuters) - Two U.S. B-1 bombers carried out a training exercise on Tuesday with Japanese and South Korean military aircraft in the vicinity of the Sea of Japan, the U.S. military said, amid growing tension over North Korea’s missile and nuclear programs.

It was first time U.S. Pacific Command B-1B Lancers have conducted combined training with Japanese and South Korean fighter aircraft at night, the U.S. military said in a statement.