This is essentially what Moscow sees (the arrow inside of Ukraine would be ignored if it became part of NATO):
View attachment 85672
Basically the border moving closer and closer to Russia, and sure Russia got nukes so realistically the chance of invasion is low, but looking back in history Moscow is rather paranoid (not to mention Russia has expressed many, many times it want NATO to stop expanding eastward).
And yes the baltic states are also part of NATO and they also threaten Russia (maybe less so due to geography with the small corridor between Kalingrad and Belarus and other), another fact is that they joined NATO much earlier (basically in the 1991-2000 period) when Russia and US relationship wasn't that bad.
Also, just gonna ignore
Ukrainian War Developments (#14.482) lol?