Dozens of Ukrainian children have been killed by Putin’s army

Tonight on the Last Word: Ukrainian President Volodymyr Zelenskyy makes an emotional plea to Congress. Also, Vladimir Putin’s lies and delusions are on display in a speech to Russia. Plus, Francis Fukuyama, author of “The End of History and the Last Man,” says Russia is “heading for an outright defeat in Ukraine.” And the Mariupol Theater sheltering Ukrainian civilians is bombed by Russia. Cal Perry, Rep. Adam Schiff, Angela Stenet and Andriy Kulykov also join Lawrence O’Donnell.