Locking radar onto an aircraft is considered a threat because it can signal a potential attack. Japan said there were two such incidents Saturday off its southern Okinawa islands. Japan said it scrambled fighter jets in response to the Chinese J-15 fighter jets,

Japan said on Sunday that Chinese fighter jets had directed fire-control radar at Japanese military aircraft in two "dangerous" incidents near Japan's Okinawa islands, an account Beijing denied.

Japan’s Defense Ministry said it recorded two separate incidents on Saturday in which Chinese fighter jets directed radar capable of aiding strikes at Japanese F-15 aircraft flying over international ...