China has obtained "adequate" evidence of Japanese warships and airplanes conducting close-range monitoring and surveillance of the Chinese navy.
Geng Yansheng, spokesman with the Ministry of National Defense made the announcement at a briefing on Thursday. He said China will retain the right of adopting relevant measures. Geng added that Japanese warships and airplanes have for a long time closely followed, monitored and disturbed Chinese naval ships and airplanes. Such moves harm the security of the Chinese navy and aggravate current Sino-Japanese marine security problems.