Earlier quoted context omitted.
Two can play this game. Look at Podnistria or Donbas. Belarus split between a Polish-Lithuanian Commonwealth 2.0 and a Totally-Not-Russian-Puppet-State, with several thousand young men's graves in between, isn't any better than Belarus today.
One side will have the definite firepower advantage, enough to deal with other be it puppet, not puppet or whatever. You choose what this side will be. Russians have nothing in their coffers they can spare for a puppet project when there will be a battle hardened army a day away from Moscow. It's the best way for NATO to put Russia on defensive. A solid wall of steel from Baltic to Azov to seal it shut from Europe.
Can you see the problem with NATO?
European countries are unlikely to finance the effort, our armies are for the most part underinvested and their deployment capacity very limited.
France has some capabilities, but it is also bogged down elsewhere (Sahara), because the Islamist threat is more acute for Paris than whatever Russia does.
USA and UK have two decades of nation building behind them and whatever fighting spirit is left, is reserved for a possible confrontation with China. Also, both of them are naval powers, while Belarus is a landlocked country. Not to say that they are unable to fight on land, but it is a disadvantage for them.
If you like The Lord of the Rings, we are sort-of similar to Gondor just prior to the war. Not enough power and will to hold Mordor in a siege.
The good news is that Russia is fairly strained and it is not a full Mordor either. More like a group of orc chieftains from the Misty Mountains.