Japan on Tuesday intensified the ongoing territorial dispute with China by setting up a new publicity office aimed at Diaoyu Islands-related propaganda issues.
Observers warned that the move will undermine recent efforts made by the two countries to improve ties.
On Tuesday, Chinese Ambassador to Japan Cheng Yonghua also rejected Tokyo's protest over Chinese marine surveillance vessels patrolling waters off the islands, the Chinese embassy in Japan said.
Cheng stressed that the Diaoyu Islands are China's inherent territory and so are the surrounding waters, and Chinese marine surveillance vessels are conducting regular patrols in Chinese territorial waters.
The ambassador made the remarks in a meeting with Japanese Vice-Minister of Foreign Affairs Akitaka Saiki.
Two Chinese marine surveillance ships continued patrols in territorial waters surrounding the Diaoyu Islands on Monday, according to China's State Oceanic Administration, according to Xinhua News Agency. Chinese Foreign Ministry s