WASHINGTON (AP) — President Barack Obama departed Saturday on a weeklong, 16,000-mile trip to Asia, part of his effort to pay more attention to the region and boost economic and security cooperation. He'll spend three days in Vietnam, with stops in Hanoi and Ho Chi Minh City, formerly Saigon, for meetings with leaders, a speech on U.S.-Vietnam relations, visits to cultural treasures and sessions with civic leaders and...