Yulia Navalnaya, a key opponent of Russian President Vladimir Putin, whom she holds responsible for her husband Alexei Navalnay’s death, sharply criticized UN leader António Guterres for warmly embracing Putin on Thursday. “It was the third year of the war, and the UN Secretary-General was shaking hands with a murderer,” Navalnaya posted on X above a picture of Guterres with his head bowing slightly while shaking Putin’s hand. The UN leader was in Moscow for a summit of the BRICS nations, which include Brazil, Russia, India, China, and South Africa. Her husband died in a Russian penal colony i…