Russia’s state-owned energy company Gazprom has said it will cut off Russian gas supplies to Poland and Bulgaria, two countries that have been supporting and providing military aid to Ukraine.

Russia has said it has cut off gas supplies to Poland and Bulgaria because of their continued military support to Ukraine and its reluctance to pay in rubles.

Russia’s move has been opposed by most European nations since the Kremlin proposed that Russian enemies pay in rubles. However, in response to the economic sanctions imposed on Russia, Russia demanded that the payment to be made in Russian rubles in every trade with Russia.

Oil and gas prices in the United States and European countries have risen to 40-year highs since Russia cut off supplies.