China Coast Guard claims to have expelled a Japanese fishing boat from waters around the Senkaku/Diaoyu Islands, while Tokyo reports intercepting Beijing's patrol vessels.
China sent a letter to the United Nations secretary-general, accusing Japan of violating international law by "threatening armed intervention in Taiwan."
The Japanese prime minister's comments on Taiwan and the Chinese consul general's attack have fueled tensions, causing relations between the two countries to escalate.
Japan deployed fighter jets to track a suspected Chinese unmanned aerial vehicle as it flew through the waters between the frontline island of Yonaguni and Taiwan.
