Ukrainian Prime Minister Arseniy Yatsenyuk says he will introduce a ban on oil products from Russia.
Ukraine has put up stiff barriers against goods from Russia over Moscow's 2014 annexation of Ukraine's Crimean Peninsula and its support for separatists in eastern Ukraine.
Russia has responded with its own trade ban on Ukrainian goods.
Yatsenyuk told a government meeting in Kyiv on April 6 that "we have introduced a number of sanctions against Russia. But for some reason, one of the key elements -- the purchase of Russian oil products -- did not make this list."
He asked the economy minister to "develop a mechanism for banning the purchase of oil products from the aggressor, which Russia is."
Ukraine and several Western countries accuse Russia of providing money, troops, and weapons to the separatists, a charge Moscow denies.
Yatsenyuk added that he wanted to exclude Russia from proposed legislation eliminating import tariffs on used automobiles.