Russian energy giant Gazprom says it has halted gas exports to Poland and Bulgaria over the countries' refusal to pay for supplies in roubles.

The firm said services will not be restored until payments are made in the Russian currency.

It comes after Russian President Vladimir Putin ordered "unfriendly" countries to pay for gas in roubles.

Poland confirmed supplies had stopped, but Bulgaria said it was still unclear whether supplies had been halted.

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