Putin still found supporters! He murdered already before he became a mass murder of civilians in Ukraine:

Fiona Hill, Politico Magazine,2022-02-28

...Russian operatives poisoned Alexander Litvinenko with radioactive polonium and turned him into a human dirty bomb and polonium was spread all around London at every spot that poor man visited. He died a horrible death as a result.

The Russians have already used a weapons-grade nerve agent, Novichok. They’ve used it possibly several times, but for certain twice. Once in Salisbury, England, where it was rubbed all over the doorknob of Sergei Skripal and his daughter Yulia, who actually didn’t die; but the nerve agent contaminated the city of Salisbury, and anybody else who came into contact with it got sickened. Novichok killed a British citizen, Dawn Sturgess, because the assassins stored it in a perfume bottle which was discarded into a charity donation box where it was found by Sturgess and her partner. There was enough nerve agent in that bottle to kill several thousand people. The second time was in Alexander Navalny’s underpants.