The BBC is reporting Russia has told “unfriendly” foreign countries they must start paying for gas in roubles or it will cut supplies.
Russian President, Vladimir Putin, has signed a decree stating buyers “must open rouble accounts in Russian banks” from Friday.
Mr Putin’s demand is being seen as an attempt to boost the rouble, which has been hit by Western sanctions.
Western companies and governments have rejected Russia’s demands to pay for gas in roubles as a breach of existing contracts, which are set in euros or US dollars.
Since Russia invaded Ukraine, Western nations have issued economic and trading sanctions on Russia.
However, the European Union has not placed bans on oil or gas, unlike the United States and Canada, as its member nations rely heavily on it.
The European Union gets about 40% of its gas and 30% of its oil from Russia, and has no easy substitutes if supplies are disrupted.
Meanwhile, Russia currently gets €400m per day from gas sales to the bloc and it has no way of rerouting this supply to other markets.