In the world this week: a glimmer of hope for peace in Ukraine after marathon talks in Minsk, Nigerian islamist militants Boko Haram launch their first deadly attack on neighbouring Chad, HSBC is stung by a report that shows the bank helped a host of wealthy clients dodge tax, and ex-IMF boss Dominique Strauss-Khan takes the stand accused of 'aggravated pimping'. Is the former presidential hopeful merely a libertine, or a criminal guilty of procuring prostitutes for his notorious sex parties?

Produced by Cecile Khindria and Haxie Meyers-Belkin

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