US President Donald Trump landed in South Korea on Wednesday for the final leg of his Asia trip, optimistic about striking a trade war truce with Chinese President Xi Jinping after summit talks with South Korea’s Lee Jae-myung. Arriving from Tokyo hours after North Korea test-fired a nuclear-capable cruise missile, Trump is due to address a summit of CEOs and meet Lee in Gyeongju, a sleepy South Korean town filled with historic tombs and palaces. The main item on Wednesday’s agenda will be the...