Putin has repeatedly and viciously committed war crimes in Ukraine which is beyond doubt but he has a long way to go to equal Hitler. Hitler embarked on creating an industrial machine involving hundreds of thousands of willing participants to embark on the annihilation of a race the Jews along with homosexuals, dissidents, disabled, communists and anyone who in any way showed any opposition to National Socialism.
By genocide, the murder of hostages, reprisal raids, forced labour, "euthanasia," starvation, exposure, medical experiments, and terror bombing, and in the concentration and death camps, the Nazis murdered from 15,003,000 to 31,595,000 people, most likely 20,946,000 men, women, handicapped, aged, sick, prisoners of war, forced labourers, camp inmates, critics, homosexuals, Jews, Slavs, Serbs, Germans, Czechs, Italians, Poles, French, Ukrainians, and many others. Among them, 1,000,000 were children under eighteen years of age. And none of these monstrous figures even include civilian and military combat or war deaths.
He invaded and annexed multiple countries starting with Poland, the Czech Republic Austria and many others in short order and at the end of his murderous reign Europe lay in ruins and 50 million people had died.
He also built an unrivalled military-industrial machine that enabled in the early days of the war to have massive superiority in theatre and probably had the fanatical devotion of a goodly proportion of the German population and fellow fascist travellers in other states to aid him.
Maybe Putin wishes he had that sort of following and power but he falls short in so many ways. A mafia kleptocratic state yes, a calculating evil godfather President for sure but he is no Hitler. In the annals of history, there has probably been no one eviler than him and we should be careful in making comparisons as he infamously stands in a terrible class of his own without equal in the annals of history.
My father fought in WW2 for 5 long years and saw at first-hand the destruction of Europe and the evil that he unleashed on the world, it shaped his very soul for the rest of his life and I was brought up reading hundreds of books and discussing, listening and arguing with him about the war as if it was my mother's milk. If anything a more apt comparison would maybe Mussolini.