When that start, China don`t have choice but to support Russia
If past centuries teach us any lesson it is this: strong, aggressive Russia is a problem to all its neighbours; weak, divided Russia is a problem mostly to itself. And so it is quite obvious what its neighbours would aim for.
It's always pro-Putin crowd speaking about the possibility of WW3. Why? Because it's a scaremongering tactics. Russians and their lackeys have no other arguments.
No moral argument - because they are warmongering ******** invading another country.
No economic argument - because the West needs nothing from Russia except for raw materials. And is fixing the situation with raw materials right now.
They used to try and scare the West with the might of the Russian military. "We may repeat" Russians used to say, which was intended to remind Westerners of the Soviet push to Berlin in the years 1943-45. And threaten them with another western offensive - this time against them. But since the Russian army got bogged down in Ukraine, stopped by a military of a much weaker, much poorer country, this threat no longer works. It might have still been effective against the Baltic States, but NATO sent enough soldiers East to repel any such effort.
So what remains for the morally bankrupt, poverty-stricken Russia? The threat of its nuclear arsenal (as long as they're able to fund its serious upkeep). Any effort to counter Russian imperialistic efforts are met with suggestions of using nuclear missiles.
If it was formulated by early communists, those from 30-50s, it may have been more effective. Some of them were true believers, ready to die for the victory of communism. But Russian cleptocrats of today have no strong ideological drive. And Putin himself is one of the main cleptocrats, with a fortune worth billions of $. Such people do not commit nuclear suicide. So the world shrugs and keeps sanctioning Russia to hell and aiding Ukrainians with more and more shiny weaponry.