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The latest negotiations to end the Russian invasion of Ukraine produced no breakthroughs, after U.S. envoys held a 5-hour session in the Kremlin. Alas, almost another full year has come and gone, and the war grinds on, despite President Trump's boast that he would end the conflict in 24 hours. In this episode, The Wall Street Journal's chief foreign affairs correspondent Yaroslav Trofimov tells us why negotiations are failing to end Putin's war of aggression.