Washington (AFP) – Chinese President Xi Jinping warned his US counterpart Joe Biden not to “play with fire” over the self-ruled island of Taiwan during a lengthy phone call Thursday that the White House said aimed to steady the superpowers’ rocky relationship. A statement relayed by Chinese state media said the call, lasting two hours and 17 minutes according to the White House, was “candid” — often diplomatic speak for a difficult exchange. State-run Xinhua agency said Xi delivered harsh words on US policy towards Taiwan, a democratic island with close ties to the United States but which Chi…