TOKYO (AP) — Vice President Joe Biden says the U.S. is deeply concerned about China's recent decision to unilaterally declare an air defense zone in the East China Sea.

Biden, who spoke today after a meeting in Japan with Prime Minister Shinzo Abe (shin-zoh ah-bay), says he'll raise U.S. concerns when he meets later this week in Beijing with Chinese President Xi Jinping (shee jihn-peeng).

The U.S. and Japan have refused to recognize China's air defense zone above tiny islands that China and Japan both claim.