Several countries are relying on their own limited reserves of gas
Exports of Russian gas to Europe via Ukraine appear to have completely stopped amid a dispute over gas supplies between the two countries.
Heating systems shut down in some parts of central Europe, as outdoor temperatures plunged to -10C or lower.
Russia and Ukraine have blamed each other, and the EU says it wants its own monitors to check the flow of gas.
The EU depends on Russia for about a quarter of its total gas supplies, some 80% of which is pumped through Ukraine.
The list of countries that have reported a total halt of Russian supplies via Ukraine includes Romania, the Czech Republic, Slovakia, Bosnia-Hercegovina, Bulgaria, Croatia, Greece, Hungary, Macedonia, Serbia, and Austria.
Italy said it had received only 10% of its expected supply.
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