Russia has stopped gas supplies to Europe via a major pipeline.
The country claims repairs are needed.
State-owned energy giant, Gazprom, says the restrictions on the Nord Stream 1 pipeline would last for the next three days.
Already Russia has reduced gas exports via the pipeline.
Russia has also denied accusations it has used energy supplies as a weapon of war against Western countries.
The Nord Stream 1 pipeline stretches 745 miles under the Baltic Sea from the Russian coast near St Petersburg to north-eastern Germany.
It opened in 2011, and can send a maximum of 170 million cubic metres of gas per day from Russia to Germany.
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