There are only about 190K active, effective military left in Ukraine, after huge losses in war with Russia.
Russia has over 500K active, effective military forces.
If things continue to escalate, Russia will cut off Poland from Ukraine, because most weapons are being supplied through Poland to Ukraine from NATO.
Power abhors a vacuum, and many countries are looking at or salivating over a weakened Ukraine, in order to expand their territories, including Romania, Hungary, and Poland, just to name a few.
There are many assumptions being made about war that are not true in Ukraine, including the build up of fortifications, and now company sized counter attacks against Russia.
Russia has changed from a special operation to an all out war, and wining at any cost, using whatever tactics are needed.Douglas Macgregor – Break Through The Defenses – YouTube