US President Joe Biden’s comment that Russian leader Vladimir Putin “cannot remain in power” continued to generate outrage in Moscow on Sunday. Prominent Russian Senator Konstantin Kosachev, chair of the Foreign Affairs Committee in parliament’s upper house, claimed Biden made statements with “frightening regularity” that are worse than crimes. There had been times in the past when the word of a US president carried weight, but that is over, he said. Biden, at the end of a fiery speech in Warsaw on Saturday night, said of Putin: “For God’s sake, this man cannot remain in power.” The remark was…