Japan's been claiming a South Korean Navy destroyer recently used its targeting radar to lock on to a Japanese patrol plane.
But experts here in South Korea who've seen video from the Japanese plane are saying that did not happen -- furthermore, they say, it was the plane flying at a low altitude over the ship that was threatening.
An expert from the Korea Research Institute for Military Affairs says the plane was never in a position where it could have been in the fire control radar's beams because of the limited angles at which the radar operates.
On December 20th, the Korean destroyer was conducting a humanitarian search for a North Korean ship in the East Sea when a Japanese patrol plane approached it at close range.