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    Biden calls Putin 'crazy SOB,' plans new sanctions against Russia

    02:21
  • Historic number of women join Ukraine’s army fighting Russia

    02:34
  • Putin denies Russia plans to put nuclear weapons in space

    01:22
  • American ballerina detained in Russia on suspicion of treason

    03:49
  • Ukrainian documentarian: Ukraine is ‘a humanitarian catastrophe,’ but ‘a bargaining chip for some’

    03:30
  • Amb. Markarova: U.S. has to ‘be bold,’ ‘sanction all Russian banks,’ to stop Russian ‘war crimes’

    07:34
  • Alexei Navalny’s widow says 'we will find out' how he died

    02:16
  • Navalny's widow accuses Kremlin of hiding her husband's body to cover up his death

    02:30
  • Alarming new warnings about Russian-held Zaporizhzhia nuclear power plant

    02:51
  • Russia claims complete control of the Ukrainian city of Avdiivka

    01:01
  • VP Harris: ‘This is a moment where America has the ability to actually demonstrate through action’

    05:27
  • McFaul: It’s ‘hard’ for Navalnaya to fight Putin but Congress has ‘something right in front of them’

    10:49
  • Hundreds detained in Russia at events honoring Alexei Navalny

    02:24
  • Russian forces take control of key eastern town in Ukraine

    03:48
  • Biden: 'No doubt' Putin is responsible for Navalny's death

    02:04
  • Video shows front line shelling by Ukraine's Azov Brigade

    01:03
  • House expected not to consider Senate’s foreign aid package

    02:57
  • Ukrainian military video said to show a naval drone attack on a Russian landing ship

    00:53
  • Ukraine says delay in U.S. aid from Congress is impacting battlefield

    01:54
  • Non-profit pushes for U.S. aid to help demine Ukraine

    04:31

Breaking down why Biden administration changed position on sending tanks to Ukraine

01:19

In an about-face, President Joe Biden announced that the United States will send 31 M1 Abrams tanks to Ukraine after previously being opposed to the move. NBC News' Kristen Welker explains why the Biden administration reversed course.