Interact with Ukraine Daily Summary - Tuesday, April 18

Wagner ex-commanders tell Russian opposition media of their war crimes in Ukraine, Kyiv launches investigation -- Russia blocking 50 ships with Ukrainian grain in Black Sea -- Slovakia delivers MiG jets; no Chinese weapons found on the battlefield -- Ombudsman says his office has received 'dozens' of videos with alleged executions of Ukrainian POWs -- Russia increases air strikes, artillery attacks on Bakhmut -- and more