Russia's economy has been hurt by two big things: the falling price of oil and economic sanctions. (Remember Crimea?) The oil and gas industry generates about half of Russia's revenue, so when a combination of the shale boom in the U.S. and weaker demand worldwide pushed the price from $110 per barrel earlier this year to $60, Russia got hammered. The sanctions imposed by Europe and the U.S., designed to punish Russia's companies for President Vladimir Putin's actions in Ukraine, have hurt, too.