Why Russia isn't using it's full force in Ukraine ?
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A short answer is: Russia's using as much weapons and soldiers as it can afford to allocate for this war. If they will use more force they will start losing their own territories starting from Chechnya where Putin's henchmen can control the region only with the help of Russian army.
Heard that Putin is unwell and that he is suffering from a rare cancer and his body is shaking already.
Putin must rest now and transfer the power to someone else - who really thinks that peace is possible and rather than deadlock one should go for dialogue.
There are speculation in main stream and social media that he is suffering from some type of cancer or Parkinson's disease but we know that truth is the first victim when war breaks out so hard to believe what is being reported. After invading Ukraine Putin has had shaky media appearances and has been described — with varying reliability — as suffering from everything from Parkinson's disease to dementia.