BELGRADE, June 3 (Reuters) – Hungary’s largest oil and gas corporation, MOL, has asked the U.S. government for a one-month extension to ‌complete talks to buy a majority stake in Serbia’s ‌NIS, an oil company controlled by Russia, Serbia’s energy minister said on Wednesday.

The request ​comes ahead of a June 6 deadline following a two-week extension which MOL secured last month to finalise negotiations with Russia’s Gazprom Neft over its planned purchase of a 56.16% stake in NIS.

NIS is subject ‌to U.S. sanctions imposed ⁠in October over its Russian ownership, part of broader measures targeting Moscow’s energy sector following its invasion of ⁠Ukraine. Washington has pushed for the divestment of the Russian stake.

“MOL has asked OFAC (Office of Foreign Assets Control) for additional time to complete negotiations ​on NIS ​sale,” Serbian Energy Minister Dubravka ​Djedovic Handanovic said after a ‌meeting with Gazprom Neft CEO Alexander Dyukov in St Petersburg.

“They have asked for additional 30 days to complete negotiations,” Handanovic said in a statement.

She said that Dyukov had said that NIS would also ask the U.S. for an extension of an operating licence which is ‌due to expire on June 16.

MOL said ​on January 19 it had signed a ​binding agreement with Gazprom ​Neft and Gazprom to buy their combined stake in ‌NIS. It did not disclose ​the price.

Serbia holds a ​29.9% stake in NIS while the remainder is held by minority shareholders.

Belgrade and MOL must also agree on the company’s ​future operations before the ‌transaction can be completed. NIS runs Serbia’s only oil refinery, ​making it central to the country’s energy supply.

(Reporting by ​Ivana Sekularac; Editing by Emelia Sithole-Matarise)