U.S. President Joe Biden accidentally misspoke when he called Ukrainian President Volodymyr Zelensky "President Putin" at a ceremony on the sidelines of the NATO summit in Washington, Reuters reported. "Now I want to turn the floor over to the president of Ukraine, who has as much courage as he does determination. Ladies and gentlemen, President Putin," Biden said. He quickly realized the mistake and said: "President Putin? He [Zelensky] will beat President Putin. I'm so focused on defeating President Putin that we have to worry about that." "I'm better than that," joked Zelensky, who was standing next to him. "You're a hell of a lot better," Biden said.