Shafaq News/ Russia has halted supplies of oil to Poland via the Druzhba pipeline, the chief executive of Polish refiner PKN Orlen said on Saturday, adding that the company would tap alternative sources to plug the gap.

The halt in supplies via the pipeline - which has been exempted from EU sanctions imposed on Russia following its full-scale invasion of Ukraine - came a day after Poland delivered its first Leopard tanks to Ukraine.

"We're effectively securing supplies. Russia has halted supplies to Poland, for which we are prepared. Only 10% of crude oil has been coming from Russia and we will replace it with oil from other sources," PKN Orlen Chief Executive Daniel Obajtek wrote on Twitter.

The company said it could fully supply its refineries via sea and that the halt in pipeline supplies would not impact deliveries of gasoline and diesel to clients.

As of February, after a contract with Russia's Rosneft expired, Orlen has been getting oil under a deal with Russia's oil and natural gas company Tatneft.

Tatneft and Russian oil pipeline monopoly Transneft did not immediately respond to a request for comment.

The supply halt came after U.S. President Joe Biden visited Warsaw and Kyiv this week in a show of support for Ukraine a year after the invasion.

On Friday, the European Union agreed on a 10th package of sanctions on Russia.

Following the invasion of Ukraine and before the EU embargoed seaborne supplies from Russia, Orlen stopped buying Russian oil and fuels via the sea.

The company's supply portfolio now includes oil from Western Africa, the Mediterranean, the Gulf and the Gulf of Mexico, it said. It also has a supply contract with Saudi Aramco as of 2022.

Seaborne supplies reach Poland via Naftoport, an oil terminal in Gdansk on the Baltic Sea. It can receive 36 million tonnes of oil annually topping volumes that can be processed by Polish refineries and is in part used to supply oil to refineries in eastern Germany that are linked to Druzhba.

"Given the capacity of Naftoport and the fact that we also have other routes to import motor fuels, clients will not feel any impact, while Orlen has been prepared for this for months," Mateusz Berger, Secretary of State in charge of strategic energy infrastructure told Reuters by phone.