Zelenskyy expected to meet Biden this week after dire warnings about Putin
Ukrainian President Volodymyr Zelenskyy said he believes Russian leader Vladimir Putin will continue to use the threat of nuclear war to stoke instability in an interview with "60 Minutes" that aired over the weekend. Zelenskyy is expected to speak at the United Nations General Assembly and meet with President Biden during a visit to the U.S. this week. CBS News foreign correspondent Imtiaz Tyab has more from Kyiv.