Tokyo, Dec. 11 (Jiji Press)--Japanese fighter jets joined U.S. bombers in exercises over the Sea of Japan on Wednesday, the Japanese Joint Staff said Thursday, in what was seen as a coordinated move aimed at countering military threats from China and Russia. The joint flight involved three F-35s and three F-15s from the Japanese Air Self-Defense Force and two U.S. B-52 strategic bombers, ac...