Beyond the probable show of unity at this week's summit in Ankara, there could be trouble ahead for the alliance if the US continues down an isolationist path

When he steps off the plane in Ankara for this week's NATO summit, it will be the president's first trip to Turkey since he regained the White House.

The upcoming NATO summit hosted by Ankara is not merely another routine meeting of a military alliance accustomed to reviewing its defense plans and

Defence spending, Ukraine and the Iran conflict will dominate the Ankara meeting

The US president has praised both leaders for their strength and charm