http://www.bloomberg.com/news/2014-03-25/russian-oil-seen-heading...

http://www.bloomberg.com/news/2014-03-25/russian-oil-seen-heading-east-not-west-in-crimea-spat.html

Such shifts will be hard to overcome. Europe, which gets about 30 percent of its natural gas from Russia, has few viable immediate alternatives. The U.S., even after the shale boom, must import 40 percent of its crude oil, 10.6 million barrels a day that leaves the country vulnerable to global markets.