NATO ambassadors are to hold an urgent meeting on Friday to discuss US President Donald Trump's announcement he was pulling his country out of the Open Skies Treaty with Russia, a diplomat told AFP. The planned meeting of the ambassadors making up the North Atlantic Council -- the top political body guiding NATO -- follows Trump's declaration on Thursday that the US would leave the pact effective in six months' time unless his administration deemed Russia had come back into line with it. csg-rmb/har