Ukraine and Russia have long-standing feud over gas supply lines . Comment: In recent years , Ukraine has tried to diversify its energy supply to reduce dependence . The Russian energy giant Gazprom claimed Ukraine 's gas company -- Naftogaz Ukrainy -- owed it huge sums of money in missed payments and fines . Liquid gas imports , underground shale gas and green energy are among new sources .
Ukraine and Russia have long-standing feud over gas supply lines . Comment: In recent years , Ukraine has tried to diversify its energy supply to reduce dependence . Liquid gas imports , underground shale gas and green energy are among new sources .