Beijing - China and Japan are blaming each other for a close encounter between military jets over the East China Sea.
China's defence ministry said on Thursday that Japanese F-15 fighters followed a Chinese TU-154 plane on a regular patrol on Wednesday morning and got as close as 30m. It released two videos on its website purporting to show the incident, which it said had "seriously affected" the safety of the Chinese plane.
Japanese Chief Cabinet Secretary Yoshihide Suga denied on Thursday that Japanese aircraft had approached a Chinese plane and said Japan stood by the version it gave on Wednesday, that two Chinese SU27 fighters had posed a danger to Japanese aircraft by flying near them. "Chinese criticism is irrelevant", Suga said.
On Wednesday, Japan lodged a diplomatic protest with Beijing over the incident and on Thursday the foreign ministry summoned China's ambassador.
Tensions between the two Asian rivals have worsened in recent years over a group of uninhabited islands in the East China Sea called Senkaku in Japanese and Diaoyu in Chinese. Japan controls the islands but China also claims them.
The two countries have increased patrols by ships and military planes to press their conflicting territorial claims. They had a similar incident on 24 May.
"The latest incident occurred despite our strong protest and request for preventive efforts following the previous incident, and the government of Japan takes it extremely seriously", Japanese Deputy foreign minister Akitaka Saiki told reporters after meeting with Ambassador Cheng Yonghua.