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• Russia is escalating a conflict over gas and turning off the tap on supplies to Poland and Bulgaria.

• Supplies to both countries are now slated to end on April 27, after they refused to pay in rubles.

• Russia gave an ultimatum in March that "unfriendly" nations must pay for energy supplies in rubles.

Russia turned off its gas supplies to both Poland and Bulgaria on Wednesday after both countries refused to pay for energy supplies in rubles.

In a statement seen by Reuters, Russian energy corporation Gazprom confirmed that the gas supplies to the two countries have been cut.

"Gazprom has completely suspended gas supplies to Bulgargaz (Bulgaria) and PGNiG (Poland) due to absence of payments in rubles," read a statement from Gazprom seen by Reuters.

Poland's national gas firm, PGNiG, said in a statement that it was notified by Gazprom on April 26 that deliveries of gas supplies running through the Yamal pipeline would be wholly suspended unless their payment was issued in rubles.

"The companies are monitoring the situation and are prepared for various scenarios," wrote PGNiG in its statement, adding that it was working to find alternative gas suppliers and that its fuel reserves are sufficiently stocked-up.

According to CNBC, Poland receives around 9 billion cubic meters of Russian gas via the Yamal pipeline every year.

Polish Prime Minister Mateusz Morawiecki told the press on Tuesday, before the announcement, that the Kremlin may "punish Poland" for opposing its invasion of Ukraine, per Bloomberg. The cutting-off of supplies also coincides with further sanctions from Poland on Russian oligarchs and organizations — including Gazprom.

Meanwhile, Poland's environment and climate minister tweeted on Tuesday that Polish citizens should not expect an interruption to its energy supplies.

"Poland has the necessary gas reserves and sources of supply that protect our security - we have been effectively independent from Russia for years," Moskwa tweeted. "Our warehouses are 76% full. There will be no shortage of gas in Polish homes."

Gazprom also notified Bulgaria's energy ministry that its energy supplies would be cut off. According to CNN, its energy ministry said that the Bulgarians were not rationing gas in response to Russia's move, and have taken steps to find other sources of natural gas.

Bulgaria's energy ministry added that it had "fully fulfilled its obligations and has made all payments required under this contract in a timely manner, diligently and in accordance with its provisions."