Ukraine has been buying Russian gas and supplying its citizens with it for years. However, due to current political and military situation future supplies might be suspended if not permanently canceled.
Ukraine cannot buy gas from country which has annexed part of its territory and has destabilized situation in another part.
Import of energy from our European neighbors may become an issue of top priority for Ukraine in 2015. Today Naftogaz of Ukraine works on minimization of consumption of Russian gas.