Japan has agreed in principle to allow expanded fishing by Taiwanese boats in disputed waters of the East China Sea, Taiwan Foreign Minister David Lin said Wednesday.

"They are willing to extend the fishing area, which we hope will be clearly drawn in longitude and latitude coordinates," Lin told reporters at the foreign ministry. "As for how big the area will be, that is the focus of bilateral negotiations."

Lin attributed long-standing fishing disputes between Taiwan and Japan in the contested waters off the Senkaku Islands, known as Tiaoyutai in Taiwan, to the lack of clear lines of demarcation.