Russian reshuffle: Putin replaces defence minister 28:45

Russian President Vladimir Putin is replacing his long-standing ally Sergei Shoigu as defence minister. Mr Shoigu, who has played a key role in the war in Ukraine, is to be appointed the head of Russia's Security Council. Also: The government crackdown on dissent in Tunisia, and the geologist who claims to have solved the mystery of where the Mona Lisa was painted.