Heh... I disagree. Russia took terrain in 2014 and is taking it right now. Because of what? Thay have enought place to live. No one want to cooperate with Russia. They invaded us (Poland) so many times that we prefer west.
Second thing. Russia is not slavic, there is slavic language used but Russia is currently joining a lot of nations (about 190) - it will be much metter if will be split into many lands.