KIEV, July 17 - Ukraine's government must keep the disputed 18% stake in UkrTatNafta, the country's largest oil refinery, following a deal with Russian oil company Tatneft, Economy Minister Anatoliy Kinakh said Tuesday.

The government, through a court ruling, recently canceled privatization of the stake, which had been de-facto controlled by Tatneft, in order to consolidate majority interest in the refinery.