TOKYO (AP) -- Vice President Joe Biden says the U.S. is deeply concerned about China's attempt to unilaterally change the status quo in the East China Sea.
Biden says China's declaration of a new air defense zone has raised regional tensions and increased the risk of accidents and miscalculation.
He says he'll raise U.S. concerns with great specificity when he meets with Chinese President Xi Jinping later this week in Beijing.
Biden spoke after meeting in Tokyo with Japanese Prime Minister Shinzo Abe. The meeting between Biden and Abe comes on the first full day of the vice president's weeklong trip to Japan, China and South Korea.
The U.S. and Japan have refused to recognize China's air defense zone above tiny islands that China and Japan both claim. The U.S. and its allies are concerned China's move is part of a broader strategy to assert increasing authority in the region.