China , U.S. officials say , is growing more concerned about the North 's provocations , but it also is closely watching Washington 's latest military moves in the region . America : The United States will defend itself and its allies if needed , Kerry said . Kerry 's Asia tour will include visits to China and Japan . His three host nations all have new leaders .
America : The United States will defend itself and its allies if needed , Kerry said . Kerry 's Asia tour will include visits to China and Japan . His three host nations all have new leaders .