Earlier quoted context omitted.
« Russia can retreat into their internationally recognized borders at any time. » The US has around 900 military bases abroad. Far more than all other countries combined. These bases are a constant source of threats and bullying, deploying and projecting a GDP largely based on death and destruction. Why don't the US retreat into their internationally recognized borders?
As the current situation in Middle East shows, these military bases loose their military function very fast in 21st century.
If “nukes” existed many of these bases, being somewhat removed from human settlements, could be destroyed much more effectively and without much “collateral damage”. As the US and NATO hide behind Ukraine, other “players” could hide behind just any type of “terrorist”, just as the US/UK have done again and again.