The reasons for Russia's hyperagression are simple and stated by Putin himself - he sees it as reacting to an existential threat. Right now US can't do a preemptive nuclear strike without retaliation. If military bases pop up in Ukraine the russians will have no chance to react. And US knows it and has been actively involved in Ukraine's affairs for a decade and now Ukrainians are paying the price. Putin will "watch the world burn" before it sees Ukr fall into US sfere of influence. And the worst part is that Putin can't win. Ukrainians are already against Russia the same as afghani people hate the US liberators. Putin's country and army will get increasingly depleted until there will be no other options left on the table. If this war takes more than six months we're going to see some beautiful mushroom clouds. P.S. I don't think the cockroaches are going to care who's to blame for the anihilation of our species.