Newsweek put the question to a range of experts. This is what they said.

If the West continues to stand by while Russian and North Korean forces wage war against Ukraine without significantly increasing support for Kyiv, the result will be greater chaos and the

Report outlines how European Union citizens should increase preparedness in case of emergencies, including Russian aggression.

Once the artillery and glide bombs stop falling in Ukraine, Russia will still pose a significant threat to the West and, of course, NATO. How much of a threat depends upon how the war ends.

The official warns that from Putin's vantage point, though, deep dissatisfaction with the situation in Ukraine and fear of the west turning the tide might actually provoke a nuclear display of some sort—one intended to shock the west and bring a halt to the war. The supply of western arms is also now a serious game changer, resupplying Ukraine while Russia is increasingly constrained. "Escalation is now a true danger," says the senior official.

Nina Khrushcheva said she fears Russian President Vladimir Putin will eventually deploy tactical nuclear weapons to claim victory in Ukraine.

It’s good we’re ignoring Russian President Vladimir Putin’s demands to stop aiding Ukraine. But we should grasp what that might lead to.