Deliveries of Russian natural gas to Bosnia and Hungary have been halted.
Bosnia, which gets all of its gas from Russia, was informed by Hungarian gas transporter FGSZ that Ukraine and Russia have decreased natural gas deliveries towards Bosnia-Hercegovina by 100%.
At 3.30pm (2.30pm Irish time), Russian gas deliveries to Hungary, via Ukraine, also stopped completely.
Bulgaria has resorted to rationing supplies to industry while Slovakia declared a 'a state of energy emergency'.
Austria, Croatia, Czech Republic, Greece, Macedonia, Poland, Romania, Serbia, Slovakia, Slovenia and Turkey all reported deep cuts in their gas supplies.
Meanwhile, Ukraine said it would send the head of its gas company to Moscow this week to resume talks with Russian gas giant Gazprom.
In Moscow, Gazprom quickly reiterated its readiness to resume talks immediately.
‘We are ready to start negotiations, considering the crisis situation, at any minute,’ Gazprom spokesman Sergei Kupriyanov said.
Mr Kupriyanov said however that the Russian company was ‘surprised’ Ukraine wanted to wait another two days before returning to the negotiating table.
The current gas crisis was triggered when negotiations between Gazprom and Naftogaz collapsed shortly before midnight on New Year's Eve, prompting Russia to follow through the next morning in cutting off gas supplies to Ukraine.
In the days that followed, Gazprom accused Ukraine of illegally siphoning Russian gas from pipelines crossing its territory, gas that was meant to be sent to Gazprom customers in Europe.
Ukraine denied that accusation, instead blaming Russia for intentionally reducing volumes of gas to provoke a crisis.
According to Bord Gáis, there is no indication that Ireland's gas supplies will be affected by the dispute.
Ireland's gas is sourced from the Kinsale gas field and British and Norwegian gas fields in the North Sea.
