President Volodymyr Zelenskyy says Ukraine desperately needs tanks to fight Russia. The US, which has provided many other weapons, is refusing.This episode was produced by Victoria Chamberlin, edited and fact-checked by Matt Collette, engineered by Paul Robert Mounsey, and hosted by Noel King.Transcript at vox.com/todayexplained  Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices