MOSCOW - Tensions between Russia and Ukraine escalated further on Nov. 25 as Ukraine decided to 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
Associated Press: Ukraine stops buying Russian gas, closes airspace
A picture taken on April 22, 2015 shows a gas installation at a gas-pumping station on the gas pipeline in the small town Boyarka on April 22, 2015 in the Kyiv Oblast.
