Senior Chinese leaders conveyed a heightened sense of alarm on Thursday about their nation’s relations with Taiwan, and they strongly warned the United States national security adviser, Condoleezza Rice, that continued American sales of high-tech weapons to Taiwan would increase the chances of conflict, a Bush administration official said. Jiang Zemin, China’s military chief, appeared agitated about Taiwan in a meeting here with Ms. Rice on Thursday, the official said. Mr. Jiang gave the visiting American delegation the impression that China was still struggling to agree on a strategy for dealing with Taiwan’s president, Chen Shui-bian. “There’s a sense that they do not know what to do,” the official said.Full Story