Factbox-NATO Ankara summit: who's going and what to expect

By Lili Bayer and Andrew GrayBRUSSELS, July 6 (Reuters) - NATO leaders will gather in Ankara for a summit on Tuesday and Wednesday, amid pressure from President Donald Trump for Europe to step up defence spending and following months of transatlantic friction over the Iran warand Greenland.The U.S.. president's frequent criticism of NATO, along with announced troop withdrawals from Europe and a six-month review of the U.S. military presence on the continent, has fuelled uncertainty within the alliance.Here is what you need to know about the summit: