I have read reports that the Russians have amassed another 300,000 troops on the Ukrainian Border with Belarus.
I have no idea what the Russian strategy might be, if they get close enough to Kiev and Kharkiev to start artillery barrages, this could force a settlement, who knows, if in fact Russia has another 300,000 troops to throw into the war, this is going to make the Ukrainian situation much more difficult.
Poland has already committed troops to Ukraine should Belarus become a combatant. Allowing attacks from their country makes them an enemy combatant.