Tensions between Russia and Ukraine escalated on Nov. 25 as Ukraine said it will stop buying Russian natural gas - hoping to rely on supplies from other countries - and closed its airspace to its eastern neighbor.
Ukraine's Energy Challenge
CBC News: Ukraine stops buying Russian gas, but Gazprom says it cut off service
An employee walks past a gas installation during a training exercise for handling emergencies at a gas-pumping station on the gas pipeline in the small town Boyarka on April 22, 2015 in the Kyiv Oblast.
