14 OSAKA, Japan — President Trump and President Xi Jinping of China agreed on Saturday to resume trade talks after a seven-week breakdown, averting for now an escalation of their multibillion-dollar tariff war that has roiled global markets and threatened the future of the world’s two largest economies. The agreement, brokered during more than an hour of discussion between the leaders, did not by itself signal any major breakthrough in resolving the fundamental conflict. But it represented a temporary cease-fire to give negotiators another chance to forge a permanent accord governing the vast flow of goods and services between the...