Is it something we really have to be overly concerned about? Naturally, the possibility is always there but how likely is it even if Putin is a full fledged psycho? Would those around him and the Russian oligarchs allow him to do that? My guess is that it is extremely unlikely.
When you think about the rich and powerful oligarchs in Russia living in luxury, does anyone really think they’d let Putin end all that by, in effect, destroying the world, thereby putting an end to their dinners in Paris, shopping in Dubai, sailing around the world on their yachts?