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Sanctions against Russia are tightened over the disputed referendum to annex Crimea. As President Putin signs a law to make Crimea part of Russia, we look at the economic consequences of a destabilised Ukraine. Also, Twitter is banned in Turkey by its Prime Minister - despite Turkey's president tweeting his disapproval of the decision. Plus, an unofficial online referendum to make Venice independent insists it is serious about going it alone. Finally, we look back at the week's biggest business stories with Simon Constable of the Wall Street Journal in the US, and Mark Gilbert from Bloomerg in London. (Image: Getty)