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 .
Ukraine and Russia have long-standing feud over gas supply lines . Ukraine is big importer of Russian gas , while Russia depends on Ukraine pipeline . 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 .