Watch: Why is there a 'black cloud' over unity at the Nato summit?
US President Donald Trump is in Turkey attending a Nato summit following a ramp up in tensions between the US and Iran.
The latest trading of strikes were not the only topic of discussion at the summit, defence spending and Trump's reiteration of his interest in purchasing Greenland were also brought up.
The BBC's Frank Gardner explains how the latest developments have cast a "black cloud" over discussions of unity at the summit.
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