How does NATO's Secretary General Jens Stoltenberg think his organization should adapt to a rapidly changing world? "The most important thing we can do is to make sure that we have strong international institutions. And that NATO remains a strong alliance, both militarily and politically." The fact that Stoltenberg stressed the importance of political evolution for a military alliance like NATO may indicate how much the modern battlefield has changed since the fall of the Berlin Wall. He spoke with Ian Bremmer on an episode of GZERO World.

Watch the full episode: Will NATO adapt to emerging global threats?