After seeing the true nature of the Russian assault on Ukraine it is time for the USA and NATO to institute a no fly zone and state that interfering will trigger whatever response is appropriate. The USA and NATO also have plenty of nuclear weapons. If Russia wants to escalate so be it.
We should also realize that the threat of nuclear war frightens not only the West but the Russians as well. The greater the fear the greater will be the spine of the Russians around Putin that can stop him.