The United States and its allies have expelled Russia from the powerful Group of 8 industralized nations in response to Russia’s annexation of Crimea from Ukraine. Ukrainian troops are leaving Crimea after it voted to join Russia following the ouster of Ukraine’s pro-Russian president, Viktor Yanukovych. The Group of 7 say they will boycott a June summit in Sochi, Russia, instead holding their own talks in Brussels. The group also threatened harsher sanctions if Russia continues its incursions in Ukraine.