aezmvp said:
The problem for Belarus is that they have an active insurgency opposition that is itching to over throw their government. The army wants exactly zero part of this conflict due to the fact that they barely hung on to power before and really it was only due to the Russians sending in forces. I'm not sure that the opposition would be so afraid of the Russians now if Belarus had to send its fairly small army to the front.
Word very early on is that if it was a complete roll over Belarus would have entered to try and cut off retreat from Kyiv but they never got close to launching because of how poorly it went. After watching the cream of the Russians get ground down over the last 9 months I'm certain that the Belarussian army has zero desire to go right into new defensive lines that have been built over 9 months with limited to no reserves in winter.
It's true that Putin might give them no choice but the consequences would be chaotic and impossible for anyone to predict accurately.
The posturing with Belarus has two principal benefits for Putin.
Politically, despite worldwide condemnation and sanctions, he makes the point to the world and his own people that Russia nonetheless still has friends and allies who are willing to welcome him.
Militarily, even if he cannot convince/compel Belarus to join in an actual attack, by just staging large joint military exercises and demonstrations near Kiev he ties down Ukrainian forces in the northwest that would otherwise be fighting Russia in the east and south.
Putin may not gain much in the end, but it costs him next to nothing to put on a threatening show with Belarus.