Russia's gas season in Europe "is coming to an end, warned the President of the European Commission - just hours after Moscow stopped supplying gas to Poland and Bulgaria.
Ursula von der Leyen said he was showing Russia "unfaithful" immigration.
Political leaders in Warsaw and Sofia have called Russian action Gazprom "fraudulent".
But the Kremlin says Western nations are forcing Russia to do so.
Kremlin spokesman Dmitry Peskov added that Moscow was still a reliable energy company.
Gazprom's next trip to Poland and Bulgaria refuses to pay for gas and Russian rubles - President Vladimir Putin's demand in March, which is intended to increase volatile spending under Western sanctions.
Should we be concerned about the problem of gas supply?
In a letter issued on Wednesday, Gazprom said it had "stopped supplying natural gas" to Poland and Bulgaria, according to Mr. Putin provided.
The agency also warned countries - Russia's gas-producing regions - that any gas emissions that other European countries aim for without a permit would lead to a significant reduction in shipping costs.
Polish state-owned gas company PGNiG has acknowledged a halt to Gazprom's imports into the country, warning that it has "maintained your right to a fair wage".
Polish President Andrej Duda has said that "appropriate legal action" will be taken against Gazprom and Deputy Foreign Minister Marcin Przydacz has told the BBC that Russia wants to "create division" among Western allies.
Gazprom says Poland and Bulgaria were the targets because they refused to pay for its gas in Russian rubles.
But Mateusz Morawiecki, Poland's president, said the oil cuts were in retaliation for Poland's announcement on Tuesday of sanctions against Russians and 50 companies, including Gazprom.
Polish consumers will still have gas from their stoves tomorrow, but supply shortages will be a major challenge for years to come.
In the first quarter of 2022, PGNiG bought 53% of its gas from Gazprom, compared to 61% last year. There is a lot of electricity that you can change instantly.
Yes, the Polish government has managed to reduce its reliance on Gazprom in recent years, by building a floating waterway on Swinoujscie - where it gets its Qatari tanks.
The capacity of the pipeline in the EU's neighboring countries is growing. Basic thinking means that Polish gas storage water is about three quarters full and consumer demand is low in water and summer.
But the reality is that Poland still needs to protect some of its annual products from strong international markets.
By the end of the year, a new pipeline that would allow Poland to import into Norway immediately - instead of moving to Russia - would come in handy.
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Bulgarian President Kiril Petkov has said that the country is reviewing all its agreements with Gazprom, which include the transfer of Russian gas to Serbia and Hungary, and has stated that "unilateral fraud is not acceptable".
Sofia, which relies on Gazprom for more than 90% of its gas, said that overnight it would have done something to find another place but no restrictions on gas use were now required by the Bulgarians.
Speaking in Brussels, Ms von der Leyen called Gazprom's actions "unfair and unacceptable", but stressed that the group was "committed to the situation".
The EU chief has reported on Bloomberg News that 10 European superpowers are in favor of paying Gazprom gas in rubles, and four energy companies have already done so.
He said the move was a "major threat" to the company and would involve "a breach of our rules".
"Our policy here is clear," said Mrs. von der Leyen.
Although the EU has agreed not to comply with Putin's demands for rubles, Hungary has reached an agreement with Gazprom.
Countries will pay into the euro account in Gazprombank, a major energy subsidy, which will amount to a few rubles.
Mr. Peskov declined to say how many other countries had agreed to pay in this way.
Prior to Gazprom's announcement, Volodymyr Zelensky, Ukraine's chief of staff, accused Russia of "producing gas in Europe".
At the same time, Vyacheslav Volodin, a spokesman for the Duma - the Russian parliament - praised Gazprom's actions and urged it to do the same in other countries "without friends".
Europe relies on Russia for more than a third of its gas needs and Gazprom only handles Russia's pipelines.
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