by Dan Martin Agence France Presse BEIJING, China (AFP) — Chinese President Xi Jinping and US Secretary of State Rex Tillerson pledged in talks Sunday to work to strengthen a relationship strained by disputes over North Korea and trade. Xi met Tillerson in Beijing just hours after nuclear-armed North Korea tested the US-China relationship anew by announcing a provocative rocket engine trial, and with delicate negotiations under way for a Xi summit with President Donald […]