Update: in addition to the Syrians and Wagner incoming (Chechens outgoing), reports this evening that troops from South Ossetia have been seen in Ukraine. Thats the occupied bit of Georgia. So troops being redeployed - from Syria and Georgia by the look of it.
I've also just seen a map detailing the supposed Belarusian plan of attack pop up. Its on an account I've followed for a considerable number of years and I tend to value (don't go as far as trust). The plan is basically to run for and take Lviv, which was the rumour...
Talk earlier today is they will join the war in the next couple of days.
So 20,000 Belarusians, 40,000 Syrians, some redeployed troops from South Ossetia and a few hundred Wagner Mercenaries potentially on the cards in the next few days.