All gas supplies halted via Ukraine to Bulgaria, Turkey, Greece and Macedonia
Bulgaria, which relies almost entirely on Russian gas for its needs, will be worst hit as, like Macedonia, it has no access to alternative pipeline routes.
The ministry told industrial users to switch to alternative fuels such as oil and urged households to start using other means for heating rather than central heating that runs on gas.
Prime Minister Sergei Stanishev called an emergency meeting later on Tuesday to discuss the situation.
Bulgaria, where temperatures dropped below minus 15 degrees overnight, started pumping a maximum 4.3 million cubic metres of gas from its sole gas storage facility, the ministry said.
The country currently consumes about 11 million cubic metres of gas a day.
Turkey can also receive Russian gas via a pipeline under the Black Sea and Greece gets additional supplies from Ankara. (Reporting by Anna Mudeva; Editing by Louise Ireland)
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