As talks swirl over U.S. President Donald Trump's commitment to NATO, both sides of the Atlantic now agree: Europe needs to step up and take more responsibility for its own defense.
The shift away from relying on America's might will be a key focus as leaders from the 32-country alliance meet for a summit in Ankara this week.
From what's happening to how far it could go, here are some of the key issues:
U.S. steps back
Trump has not been shy about his criticisms of NATO – most recently lashing out at European allies over their response to his war against Iran.
