President Joe Biden laughed off mixing up Ukrainian President Volodymyr Zelensky and Russian President Vladimir Putin on Thursday when confronted about it at his first solo press conference this year. Biden accidentally introduced Zelensky as the man who invaded his country on Thursday at the NATO summit in Washington. Later in the evening, the president held a press conference and he was confronted about the mistake, which he corrected, in the second question. You now have sort of your key...