US PRESIDENT Donald Trump arrived in Ankara this afternoon for the latest Nato summit, as the transatlantic military alliance was announcing billions in arms deals in an attempt to appease the mercurial US leader.Mr Trump, who has often complained that European allies have not spent enough on weapons of war, first sat down with Turkish leader Recep Tayyip Erdogan, a close ally who is hosting this year’s gathering and who warmly greeted the US president at a local air base and then an elaborate welcome ceremony.