Four Chinese vessels were seen again Friday in disputed waters near islands that Japan claims as its sovereign territory. It was the 28th straight day that Chinese ships have sailed near the disputed islands known as Senkaku in Japan and Diaoyu in China.
The Japan Coast Guard said it issued a warning to the vessels which were spotted in the disputed area for about 90 minutes on Friday morning.
As well as the potential mineral reserves to which ownership of the islands grants access, both countries have considerable amounts of national pride at stake in the decades-old spat.
The dispute has hit the huge trade relationship between the two largest economies in the region. Senior representatives from both governments are reportedly readying for a third round of talks on the issue.