The Situation Room with Wolf Blitzer

Ukrainian forces face increasing Russian attacks in the east and south as a third mass grave appears to have been found near Mariupol. The mayor of the besieged city claims Kremlin troops are forcing Ukrainian civilians to bury the dead in exchange for food and water. A key advisor to the mayor of Mariupol joins to comment. Also, Ukraine’s president is slamming Russia, saying it has no right to blackmail the world with the threat of using nuclear weapons.

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