Do you have any evidence of these plans?
There was a press conference where they accidentally showed a diagram with arrows continuing through Ukraine into Transnistria, which is Moldova's equivalent of the Donbass.
You have to be very ignorant of geopolitics to think that there aren't more countries like Ukraine that Russia would like to return to their empire.
Some might join voluntarily but many -- like Kazakhstan -- won't without a fight. Unlike Ukraine, most of the others are not conveniently next to Europe and hence will be impractical for western nations to support.
After Ukraine falls, Moldova is next, and then the various -stans will be rolled up in quick succession. This will create a Soviet Union 2.0, which will be a net positive for Russia, and a mixed bag for the rest of the world. It'll likely be a net negative for Europe, which is why they're supporting Ukraine now.
"the rest of Eastern Europe" was the claim
Sure, not all of Eastern Europe is at risk.
So... is that okay then in your mind? As long as Putin only takes some of Europe, that's acceptable?
If Putin ever gets tired of war, he seems to quicky recover and start again.