If Putey trie to turn off the Ukranians gas or invade the Ukraine they can and likely will start blowing up the pipeline that runs the breadth of the Ukraine. I don’t think the Russkies want that tragedy happening.
Putin will bomb Kiev and elsewhere if they do that. Thousands will die. Don’t forget we are dealing with a murdering psychopath here. Putin has no problem killing and/or jailing those who oppose him politically.
It won’t happen. Remember the Turks went public with their threat to close the Bosporus to all Russian shipping. That would crash their stock market. Block most of Russia’s grain shipments and if Turkey was attacked automatically involve NATO.
Putin’s smart enough not to overreach.
The sooner Putin and Russia is seen as monsters the sooner the world comes to grips with the problem.