Russia shrank its pipeline exports by close to 25 percent compared with a year earlier, according to the International Energy Agency. Europe’s reserves stand at just 30 percent, and Europeans are already paying exorbitant prices for energy.

The conflict is occurring when supplies of both oil and natural gas have been tight for months, driving up prices.

“There are serious concerns” that Moscow will tighten exports further and send prices higher, said Helima Croft, head of commodities at RBC Capital Markets, an investment bank.

Germany, Russia’s largest trading partner in Europe, gets 55 percent of its supply from Russia. Italy, the second-biggest trading partner, gets 41 percent. At a forum in Milan last week, the Russian ambassador Sergey Razov said President Vladimir V. Putin had told the Italian prime minister, Mario Draghi, that “if Italy needs more gas we are ready to supply it.”

Mr. Putin also made a point of saying that roughly 500 Italian businesses have operations in Russia and that bilateral investments are worth $8 billion.

Austria, Turkey and France are large consumers of Russian natural gas. In central and Eastern Europe, Hungary, Poland, the Czech Republic and Slovakia are the biggest customers, the Russian energy giant Gazprom said.

250,000 barrels a day from Russia that move through Ukraine to Hungary, Slovakia and the Czech Republic. That amount is relatively small in a global market that consumes 100 million barrels a day, but its loss could create severe shortages in those countries.

dizzying spikes in prices for energy and food and could spook investors. The economic damage from supply disruptions and economic sanctions would be severe in some countries and industries and unnoticed in others.

The money that Russia makes from energy exports could also be reduced if shippers, wary of the growing complexity of transporting Russian crude and supplies, raise what they charge Moscow, Mr. Goldwyn said.

He added it was possible that the White House would ban imports of Russian crude to the United States. Such a move, experts said, would force American refiners to rely on other suppliers and Moscow to find other buyers for around 700,000 barrels a day. China would most likely be one, after the two countries pledged to “strongly support each other.”

Flows of L.N.G. from elsewhere, mostly the United States, have exceeded Russian gas volumes to Europe in recent weeks. Such measures would probably help Western European countries like Germany and Italy more than those in southern and Eastern Europe with fewer alternatives to Russian gas.

Even without a clear cutoff of fuel by Moscow or a disruption by war, there is a substantial risk that extraordinarily high gas and electricity prices will continue, squeezing hard-pressed consumers and, possibly, pushing more businesses to scale back their operations. In recent months, some energy-intensive businesses, including fertilizer makers, have announced closures because of high gas costs.

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