You forgot about Georgia, Moldova, and Afghanistan... all of which Russian troops fully invaded (Georgia & Afghanistan) or at the very least sent core military forces to fight against in a primarily Russian-backed war (Moldova), all in the past 1 to 4 decades. Although in Afghanistan's case, it wasn't to take land or annex it or anything, it was just to overthrow the government. Still a blatant invasion though.
They've also stripped Belarus of most of its autonomy via installing a puppet government a few years after it gained independence, and have now effectively incorporated in into Russia in all but name via the Union State.
Azerbaijan and Armenia would have both likely been candidates for absorption by Russia in the future for various reasons, but that is entirely speculative, and the only ones which constantly are currently facing extreme encroachment on territory or independence by Russia are currently Belarus, Ukraine, and Georgia.
When the dictator and military leaders of a larger country are all talking about how the lands of their former domain (located in significantly smaller countries) are rightfully historically theirs and stuff, you know exactly what their goals are... It doesn't matter if it's Hitler, Mussolini, Horthy, Putin, or anyone else, their intentions are clear.