Chinese military aircraft locked radar onto Japanese Air Self-Defense Force fighter jets southeast of Okinawa's main island on Saturday, Japan's Defense Ministry said, amid heightened diplomatic tensions between the two Asian neighbors.The Chinese navy said Sunday that Japan's SDF aircraft "repeatedly approached and disrupted" the Chinese naval training maritime area and airspace, though it did not mention a radar lock-on.Chinese J-15 aircraft from the carrier Liaoning intermittently locked radar onto the F-15s on two occasions -- once around 4:32 p.m. and again around 6:37 p.m. -- the mini…READ FULL ARTICLE