I get it, but I can also see where that could be seen as provocation.
We didn't exactly like it when Cuba got cozy with the USSR - was that because we don't care about 'little countries' or was it because it appeared to be a provocative escalation?
Before saying anything else, let me say this: Putin is evil as is the invasion of Ukraine. Full Stop.
But I'll also say that some of these actions, when viewed from his perspective, are understandable. Just as we saw the USSR as encroaching on our 'safe space' he could very well view NATO expansion similarly.
Here's the ironic bit. Before Poland joined NATO, Poland, like every sovereign state, had an army.
Then Poland joined NATO, and according to Russian propagandists, those Polish soldiers suddenly became "NATO soldiers," like NATO had moved troops closer to Russia, when in fact they were already there. Poland, in fact, probably
reduced the size of her armed forces (which is why you join NATO, burden-sharing and economizing). So there were no additional troops along Russia's borders, and the American troops stayed in Germany, where they had been since 1944.
Then Putin invades Ukraine in 2014, and for the first time, NATO moves troops close to Russia, one battalion (about 1,000 soldiers) each into Estonia, Latvia, Lithuania, and Poland, in a policy called "Enhanced Forward Presence." That was not enough to invade Russia and they are there only as a tripwire, to get killed so NATO cannot back out of defending the Baltic States. Furthermore, it is probably negotiable. If Putin were to die and the next guy called NATO and said, "I'm pulling my troops out of Transnistria, Ukraine, Georgia, Armenia. We want to de-escalate things, if you withdraw the EFP battlegroups, it will be a welcome gesture," I think NATO would accept that.
Only Putin's bad behavior has caused NATO to move troops further east.