By Andrew Gray and Lili Bayer ANKARA, July 9 (Reuters) - NATO has weathered another storm from Donald Trump but European members of the military alliance are bracing for more turbulence ahead in relations with the U.S. president. It says much about the state of U.S.-European ties when a NATO summit that began with a U.S. leader ordering a cutoff in trade with one member, Spain, and rebuking others was widely hailed as a success after he re-committed to the alliance hours later.