Mary Louise Kelly

Well, fast forward four decades, we seem to be in a new nuclear era.

Cold War is over, but the questions, how do we secure the nukes, whether to build more nukes, they're as live as ever.

And those questions are on the minds of national security leaders gathering here in Munich among them.

Christine Wormuth, former Army Secretary, now President and CEO of the Nuclear Threat Initiative.

That's a nonpartisan group dedicated to reducing the nuclear threat.

Secretary Wormuth, great to see you.

Welcome to Munich.

So to take stock of where we are at this moment, the last nuclear arms treaty between the United States and Russia just expired.

Late last month, the Bulletin of Atomic Scientists, their doomsday clock was set to 85 seconds to midnight, the closest it has ever been in nearly eight decades of doing it.

How dangerous is the current moment?

The treaty that just expired, New Start, it was known as, the Russians actually offered to extend it.

Trump administration said, no, we want something better.

And so it expired.

Now we have nothing.

Good idea?

Missed opportunity?

What do you think?

But is any treaty that could be any kind of agreement toothless if China isn't in it?

What about the Europeans?

Since we're standing here in Munich, in Germany, the buzz in Europe is all about figuring out how to navigate a world where they may not be able to rely on the US nuclear umbrella.