Putin shakes up his inner circle

Vladimir Putin has dismissed his longtime Minister of Defense Sergei Shoigu and reappointed him as a national security adviser. In his place, Putin has appointed Andrei R. Belousov, an economist, to run the Ministry of Defense. The World's Marco Werman talks with Sam Greene, a professor in Russian politics and director of the Russia Institute at King's College London, about what the shake-up means for Russia's war effort and Kremlin intrigue.