BEIJING, May 29 -- China has evidence that Japanese warplanes disrupted Chinese military jets' normal flight routines, the Defense Ministry said.

Ministry spokesman Geng Yansheng made the remarks at a monthly press briefing, in response to Japanese Chief Cabinet Secretary Yoshihide Suga's allegation that a recent encounter between Chinese and Japanese warplanes was a move that could easily lead to misjudgment.

"The Chinese pilot's behavior is professional and conforms with policy," Geng said.

"More than ten times since the China Sea Air Defense Identification Zone (ADIZ) was established, Japanese military planes have approached Chinese warplanes on patrol missions, disrupting normal flying," he said.

"We have dealt with the dangerous Japanese close surveillance, and we have evidence," he said.

He disclosed that a Chinese fighter was closely tracked on Nov. 23, 2013 by two Japanese F-15 fighters for 34 minutes, with the narrowest distance of about ten meters.

China's policy related to the ADIZ conforms with international practice to deploy warplanes to recognize and verify foreign military jets which enter such zones, he said.

"Who is really making trouble in the air space?", Geng asked, saying that it is groundless for the Japanese side to put the blame on its victim rather than review its own mistakes.