BELGRADE, Serbia (AP) — The United States has introduced sanctions against Serbia’s main oil supplier, which is controlled by Russia, the company said on Thursday.

Serbia almost entirely depends on Russian gas and oil supplies, which it receives mainly through pipelines in Croatia and other neighboring states. The gas is then distributed by Petroleum Industry of Serbia (NIS), which is majority-owned by Russia’s state oil monopoly Gazprom Neft.

NIS said Thursday it had failed to secure another postponement of the U.S. sanctions, which could jeopardize its efforts to secure oil and gas deliveries in a longer term.

“The special license from the U.S. Department of the Treasury, which enables unhindered operational business, has not yet been extended,” NIS said in a statement. It added that

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