China urged the United States on Wednesday to leave the South China Sea dispute to the claimant states, saying that U.S. involvement may make the situation worse, its most direct warning to Washington in recent weeks. Chinese Vice Foreign Minister Cui Tiankai's comments to a small group of foreign reporters ahead of a meeting with U.S. officials in Hawaii this weekend come amid the biggest flare-up in regional tension in years over competing maritime sovereignty claims in the South China...