belarus (which is in a way already a part of russia) hoholstan (core russian lands) transnistria northern kazakhstan all the other churkestan lands should be left alone.  finland and poland nobody in russia see as our territories. baltics is a bit of a 50/50. personally i don't give a shit and think we should leave them alone. just make a land connection to the kaliningrad and that's it. no need to beat them with a stick.
Russian Federation