U.S. Vice President Joe Biden spent nearly an hour trying to persuade Prime Minister Shinzo Abe not to visit the war-linked Yasukuni Shrine, two weeks before a trip there sparked a furor in Asia, diplomatic sources said.

Abe visited the Shinto shrine, where convicted wartime leaders are honored along with war dead, on Dec. 26, triggering fierce criticism from China and South Korea, and leading Washington to express disappointment at his decision in an unusually explicit manner.

With U.S. President Barack Obama expected to visit in April for talks with Abe, the rising tensions between Japan and the two neighboring nations will likely be high on the agenda. The turmoil, which undermines American interests in the region, could dash Abe's hopes of boosting Japan's U.S. security alliance.