U.S. President Donald Trump's decision to pull out of a landmark arms control treaty with Russia is turning the worst fears of a dangerous weapons race into reality.

The U.S. and its allies are laying the groundwork to deploy new intermediate-range missiles in Europe for the first time since they were banned in a 1987 treaty, a move that would prompt a tit-for-tat Russian response. With a second nuclear pact likely to expire in two years, the risks of confrontation are growing.

Jens Stoltenberg, NATO's top civilian, cited recent Russian deployments and evoked a Cold War-style threat of nuclear destruction at a global conference of security and defense officials this weekend in Munich, the baroque German metropolis that's one of Europe's richest cities.