Russia's war style has always been "A Meat Grinder"

Both for their own soldiers and for those who they fight historically.

Unlike American war style they don't seem to value their own soldier's lives or the soldiers of other country's lives either. 

You can witness this in Ukraine where I would not now be surprised if Putin had the largest nuclear power plant become another Chernobyl just to empty Ukraine of most Ukrainians who don't want to die of radiation poisoning.

This is maybe the ultimate meat grinder of Putin's Russia if he radiates all of Europe and Russia and the world by allowing this to happen.

Can Ukraine win this war? This is very uncertain at this point. I think it depends mostly upon other countries in Europe and the U.S. supplying enough weapons to Ukraine to succeed and Ukraine not just running out of soldiers completely willing to die to defend Ukraine.

How long can Putin and Russia keep this up?

I'm not sure because what is happening is not logical to me unless Putin is doing this to distract his people from the serious problems Russia is encountering at home ongoing. So, in some ways maybe Ukraine is a smokescreen for the real problems Russia is facing?