Why would they? There are 8 million Russians living in the country, and close social ties besides. Putin consistently lies and says 80% of the population is Russian and that Ukraine is Russia. Plus the fact that Russian people are generally not psychopathic murderers, the invasion could only be acknowledged as a limited operation, they depend on the world and European economies, the military destroyed other countries/regions far away from NATO and then had no need for the atom bomb either... yes I think there's room for doubt.