In response to sanctions imposed by the West for the invasion of Ukraine, Russia’s Gazprom halted gas supplies to Poland and Bulgaria after they failed to pay in roubles, Reuters reported.

After the invasion of Ukraine on Feb. 24, Poland and Bulgaria became the first countries to have their gas halted by Europe’s main supplier.

As part of Russia’s response to the West’s sanctions, which include the freezing of hundreds of billions of dollars of Russian assets, President Vladimir Putin has asked for rouble payments for gas.

Only few companies have stated they would be able to pay for future supplies under the scheme announced by Moscow without breaching European Union sanctions.

The Polish gas supply contract with Gazprom covers about half of Poland’s consumption, or 10.2 billion cubic meters (bcm) per year.

Bulgaria, which heavily relies on Russian gas, has also ruled out negotiating with Gazprom to extend its natural gas purchase contract, which runs until the end of the year.