Actually,
I think the US is on a long campaign for regime change in Russia.
Part of baking that cake includes ingredients like destabilizing former soviet republics, weakening their borders, utilizing hostile NGOs in Russia, and in former soviet republics, and the economic warfare. Fomenting a coup in Ukraine was part of that plan.
Unfortunately, we've driven Russia rather straight into the arms to China, and set up the conditions for de-dollarization. Russia + China + Pakistan + Venezuela + North Korea + many others have now the means and motive to counterbalance and resist.
Russia invading Ukraine is merely seizing territory before it becomes weaponized against them in the form of an invasion staging ground. Given Russian gaps in incoming missile awareness, and the respective short distance to Moscow, they have reasons to be concerned about a hostile enemy on their border. Given Russian experience and nearness, they are likely to be incredibly scrappy as this is an existential threat to them.
The same with missiles in Cuba for us, and look what we did as a response?