European Union energy ministers hold emergency talks on Monday, as the bloc strives for a united response to Moscow's demand that European buyers pay for Russian gas in roubles or face their supply being cut off.
The meeting comes after the European Commission held discussions over the weekend with the most affected member states.
The EU is edging towards a ban on imports of Russian oil by the end of the year, diplomats said, after talks between the Commission and EU countries at the weekend ahead of meetings this week.
Ministers on Monday will also discuss the need to urgently secure non-Russian gas supplies and fill storage, as countries brace for supply shocks.
Russia halted gas supplies to Bulgaria and Poland last week after they refused to meet its demand to effectively pay in roubles.
Those countries already planned to stop using Russian gas this year and say they can cope with the stoppage, but it has raised fears that other EU countries, including Europe's gas-reliant economic powerhouse Germany, could be next.
It has also threatened to crack the EU's united front against Russia amid disagreement on the right course of action, as countries like Austria, Hungary, Italy and Slovakia all expressed reservations over the weekend about the possible embargo.
With many European companies facing gas payment deadlines later this month, EU states have a pressing need to clarify whether companies can keep buying the fuel without breaching the EU's sanctions against Russia over its invasion of Ukraine.
Moscow has said foreign gas buyers must deposit euros or dollars into an account at the privately-owned Russian bank Gazprombank, which would convert them into roubles.
The European Commission has told countries that complying with
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