By Tuvan Gumrukcu, Humeyra Pamuk and Sabine SieboldANKARA, July 7 (Reuters) - NATO leaders unveiled arms deals worth tens of billions of dollars in Turkey on Tuesday, driving home the message that they are heeding U.S. calls to spend more to defend Europe even as President Donald Trump said he felt let down and renewed his push to control Greenland.

President Donald Trump will be heading to Ankara, Turkey, for the annual NATO summit. Last year, he pushed NATO allies to spend more on defense.

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…