NATO's deputy commander told The Associated Press that he wants a summit in Turkey to spur member countries to spend more on defence, reaffirm support for Ukraine and underline the unity of the alliance. Air Chief Marshal Sir John Stringer, NATO's deputy supreme allied commander in Europe, spoke to AP in London less than two weeks before the crucial Ankara summit on July 7-8 tests the cohesion of the 77-year-old alliance. US President Donald Trump has sent conflicting signals over America's force posture in Europe, at times threatening to leave and at other times unnerving European leaders with his push to annex Greenland or his flattery of NATO adversary Russian President Vladimir Putin.