by Andrew BEATTY WASHINGTON, United States (AFP) — Barack Obama begins his 11th and final presidential trip to the Asia-Pacific in earnest on Friday, visiting China to nurture what has become arguably the world’s most important relationship and cementing an eight-year “pivot to Asia.” After a series of US stops outside Washington, the outgoing US president jets in to the picturesque Chinese city of Hangzhou where he will take part in his final G20 meeting. […]