Ankara: President Donald Trump arrived in Ankara Tuesday afternoon for the NATO summit, as the transatlantic military alliance was announcing billions in arms deals in an attempt to appease the mercurial U.S. leader.The U.S. president was expected to head first to the presidential compound of Turkish leader Recep Tayyip Erdoğan, a close ally to Trump who is hosting this year's gathering.Just before Air Force One touched down in Ankara, NATO hosted a defense forum that spotlighted billions of dollars in military projects aimed at demonstrating to Trump that European allies are investing more of their own money in defense.Also read | India-Indonesia sign BrahMos, ASTRA deal; expand bilateral ties