To make the metaphor correct, what would the US do if Mexico or Cuba asked Russia to build a military base just after the US took some of their territory and Russia continually said no.
Because Russia just took Crimea a few years ago and NATO refused to allow them to join. And Russia has agreed Crimea was part of Ukraine as recently as 1994.
Ukraine? No idea. Poland, the Baltics, the southern former Soviet republics (most of which end at -stan) to support the invasion of Afghanistan, a lot.
