can't do anything. Western boots or current military hardware will be a declaration of war; sanctions that send Russia into the stone age means Russian exports come to a complete halt, so no gas and cheap labor goods and that's a fucking no-no for mega corporations and average civvies.
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You all have to understand it's not just about the threat of nukes, but how much leverage Russia holds over things like gas and things that come out of their land that brings capitalist countries like the US to heel. That's geopolitical warfare and why Saudi Arabia is doing fine instead of being buried.