Or more truthfully Russia violates agreements with the US like the INF Treaty.
The US just withdrew from an important nuclear arms treaty with Russia. Don’t panic — yet. Aug 2, 2019
The US has officially withdrawn from a Cold War-era missile treaty with Russia that could kick-start an arms race between the world’s top two nuclear powers.
So last October, President Donald Trump proclaimed the United States would withdraw from the treaty, adding that he would give Russia 60 days — until February 2 — to come back into compliance.
But the Kremlin didn’t budge, leading Trump to put one of the last nails in the INF Treaty’s coffin during his February State of the Union address.
“Decades ago, the United States entered into a treaty with Russia in which we agreed to limit and reduce our missile capabilities,” he said. “While we followed the agreement to the letter, Russia repeatedly violated its terms. That is why I announced that the United States is officially withdrawing from the Intermediate-Range Nuclear Forces Treaty, or INF Treaty.
https://www.vox.com/world/2019/8/2/20750158/inf-treaty-trump-russia-withdraw
If Russia comes anywhere near to succeeding in Ukraine, NATO will fracture (if it hasn’t already at that point), and we’ll see a nuclear arms race in Europe (and likely elsewhere too, with Japan, S. Korea, and Taiwan all likely to participate. I’d trust most of those countries individually, with such weapons, for now, but over a longer period and adding up all the low probabilities, one arrives at a certainty of a major conflagration, and poor odds of us not getting hit. :-(