A file photo showing Bulgargas’ Chiren gas station in Chiren. Bulgaria. AP

European leaders blasted Russia's decision to cut natural gas shipments to Poland and Bulgaria as "blackmail,” saying the cutoff and the Kremlin's warning that it might cease shipments to other countries is a failed attempt to divide the West over its support for Ukraine.

The European Union has warned Russia it will not bend to "blackmail" over its support for Kyiv after the Kremlin cut off gas supplies to Bulgaria and Poland.

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Russia cuts off 2 EU nations from its gas in war escalation

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The warning on Wednesday came ahead of UN chief Antonio Guterres arriving in Kyiv to meet Ukrainian leader Volodymyr Zelensky following talks with Russian President Vladimir Putin in Moscow.

Polish Prime Minister Mateusz Morawiecki called Russia's move a "direct attack" on his country and assured that Poland would no longer need Russian gas from this autumn.

Bulgaria is almost completely dependent on Russia for gas.

Russia's move on Wednesday to use its most essential export as leverage marked a dramatic escalation in the economic war of sanctions and counter sanctions that has unfolded in parallel to the fighting on the battlefield.

UN chief Antonio Guterres attends a meeting. File/Reuters

The tactic against the two EU and NATO members could eventually force targeted nations to ration gas and deal another blow to economies suffering from rising prices. At the same time, it could deprive Russia of badly needed income to fund its war effort.

Putin issued his own warning the same day, saying that if Western forces intervene in Ukraine, they will face a "lightning-fast" military response.

"We have all the tools for this, that no one else can boast of having," the Russian leader told lawmakers, implicitly referring to Moscow's ballistic missiles and nuclear arsenal.

"We won't boast about it: we'll use them, if needed. And I want everyone to know that," he said. "We have already taken all the decisions on this."

A Gazprom logo is seen during the International Gas Forum in Saint Petersburg. File/AFP

Bulgaria, under a new liberal government that took office last fall, has cut many of its old ties to Moscow and likewise supported punitive measures against the Kremlin. It has also hosted Western fighter jets at a new NATO outpost on Bulgaria's Black Sea coast.

The gas cuts do not immediately put the two countries in any dire trouble. Poland, especially, has been working for many years to line up other suppliers, and the continent is heading into summer, making gas less essential for households.

The lettering on a sign reads 'Uwaga gaz' at the gas transmission point in Rembelszczyzna near Warsaw. AFP

Still, the cutoff and the Kremlin warning that other countries could be next sent shivers of worry through the 27-nation European Union. Germany, the largest economy on the continent, and Italy are among Europe’s biggest consumers of Russian natural gas, though they, too, have been taking steps to reduce their dependence on Moscow.

"It comes as no surprise that the Kremlin uses fossil fuels to try to blackmail us,” said EU Commission President Ursula von der Leyen. "Today, the Kremlin failed once again in his attempt to sow division amongst member states. The era of Russian fossil fuel in Europe is coming to an end.”

European Commission President Ursula von der Leyen makes a statement in Brussels on Wednesday. AFP

Most European countries have publicly balked at Russia’s demand for rubles, but it is not clear how many have actually faced the moment of decision so far. Greece’s next scheduled payment to Gazprom is due on May 25, for example, and the government must decide then whether to comply.

Polish Prime Minister Mateusz Morawiecki gives a press statement on the gas halt from Russia on Wednesday. AFP

Bulgarian Prime Minister Kiril Petkov called the suspension blackmail, adding: "We will not succumb to such a racket.”