Political and security risk updates from around the world. This week: investigation into downing of Malaysia Airlines Flight 17 concludes plane was shot down by Russian SAM brought into Ukraine from Russia and fired from rebel-controlled territory; Houthi rebels in Yemen name ‘prime minister’ and will establish new government of ‘national salvation’ to rival internationally-backed government in the south; United States confirms reports of new military air base in Agadez in central Niger capable of deploying drones; and more.