RT News - December 20, 2014 (17:00 MSK)

Moscow threatens response measures after the U.S. rolls out fresh sanctions against Crimea, banning the export and import of goods, technology and services; Muslim charities in Britain are being stripped of government grants over allegations of links to Islamic extremism; North Korea denies U.S. allegations of hacking Sony - while social media mocks Obama's slip-of-the-tongue over the matter.