@LukeAlmighty Ultimately, Putin is a Soviet nostalgist, so the ex-Soviet countries are the ones I'd be concerned about, not all the old Warsaw Pact countries. Moldova is a country people should keep their eyes on since, it has A LOT in common with both 2008 Georgia and Ukraine:

1) Ex-Soviet country
2) Struggles with a separatist republic that Russia supports
3) Its longtime-ruling pro-Russian leader has been replaced by a pro-Western president

That said, I do think that the Ukraine war has been so draining that even when Russia eventually wins, it won't be able to mess with Moldova for a good while. During that time, the West should look into ways of lessening Russian fears about Western encirclement and regime change policies without emboldening Russian expansionist ambitions. Dropping the sanctions + agreeing to no NATO membership for Ukraine in return for Russia recognizing the ex-Soviet countries as legitimate states and their borders as fixed would be a good starting point for negotiations.