Are you really that surprised,all great powers doing this kind of shit for centuries and will continue as long as human civilization exists.Big one decide while small fish need to follow their lead.Law of the stronger.In some way i even understand Russians,Nato is basically on their doorstep,how do you think America would react if Russians station their troops in Mexico or Canada.
That depends, in your analogy how much of Mexico/canida did the US invade first???
I think the whole idea of a moral equivalence here is mute, look at the twisted nationalistic, religious, intolerant hell hole that Putin has made Russia in to (not that it was much of a push) his acts of aggression are solely based on keeping the flag waving chest thumping Neanderthal "patriots" happy, because between them and the church, both keep him in power.
The west is not perfect and certainly can act purely in terms of its own self interest but, versus Russia there's no contest we have to assert ourselves, Putin can not be allowed to drag that region down unopposed, we can't allow him that inch because the miles that follow could be very bad for us all.