The Russians haven't suffered tens of thousands of casualties. That's propaganda. There's a good chance the Ukrainians have though. Their army in Mariupol is wiped out.
The Russians tried a strategy of negotiation and it didn't work out. Watch in these next two weeks what's going to happen. It's over for Ukraine.
Watch this video. And if you can't watch it all, watch the first 10-20 minutes. Scott Ritter knows his stuff.
Is Russia Losing the War in Ukraine? (Featuring Scott Ritter)
Is Russia Losing the War in Ukraine? (Featuring Scott Ritter)
https://en.wikipedia.org/wiki/Scott_Ritter#Arrests_and_conviction_for_sex_offences
What is it with Putinists and sex crimes? Seems to be a pattern there.