The shutdown of a gas pipeline in eastern Ukraine has sent a fresh wave of energy jitters through Europe.

The price of gas jumped -- then fell. The cutoff is in sharp focus because it's the first time that the war has disrupted the Russian natural gas that flows through Ukraine to get to Europe, where it powers factories and generates electricity.

Here are key things to know:

WHAT HAPPENED IN UKRAINE?

The operator of the gas pipeline system, Gas TSO of Ukraine, said it could no longer transport gas through a compressor station in the Luhansk region in eastern Ukraine, near the border with Russia. It said it had no operational control over the station in Russian-held territory, with occupying forces interfering in the station's operation and diverting gas in a way that endangered the stability of the pipeline system.

The company said it repeatedly told Russian state-owned gas exporter Gazprom about threats to flows from such interference but that its appeals were ignored.

The pipeline handles around a third of Russian gas heading to Europe. The Ukrainian operator said the gas flows could be made up through another pipeline that crosses from Russia into Ukraine near the town of Sudzha.

Gazprom said that was not possible, but gas flows at Sudzha rose overnight, by about 8 million cubic meters per day.

WHY IS THIS GETTING ATTENTION?

While Russia has halted natural gas to Poland and Bulgaria over a dispute about payments in rubles, Wednesday's cutoff is the first disruption in gas supplies flowing through Ukraine due to the war.

Any suggestion that energy supplies are vulnerable sends prices higher. Spot gas prices rose 4% at the open of trading Wednesday, to 103 euros per megawatt. They later eased, to around 95 euros per megawatt hour, below where they were Tuesday.

European governments aren't happy about sending hundreds of millions of dollars a day to Russia for energy but haven't been able to agree on a natural gas boycott because of heavy dependence of major economies like Germany and Italy. The European Union's executive commission has proposed a phaseout of Russian oil but has run up against resistance from reliant countries like Hungary.

Economists estimate that a total cutoff of both oil and natural gas would throw Europe into a recession. A loss of gas alone would hit industries such as metals, fertilizer, glass and ceramics that have already throttled back production in some cases due to high gas prices. And consumers would face even higher electric and heating bills than they already do.

To avoid those outcomes, the EU has proposed cutting Russian gas imports by two-thirds by the end of the year through additional supplies of pipeline gas from Norway and Azerbaijan, more purchases of liquefied gas that comes by ship, faster rollout of wind and solar, and conservation. Whether that can be achieved remains to be seen.

WHAT IS GOING ON WITH GAS FLOWS?

Tom Marzec-Manser, head of gas analytics at the ICIS market intelligence firm, said the Ukraine move "is not a huge cutoff to gas supplies." He described it as a loss of a few percent in overall European gas supply, when considering imports and domestic production.

"Nevertheless, it is worrying to the market that a development like this has happened," he said, noting concerns about possible energy sanctions that could interrupt deliveries and the gas cutoff to Bulgaria and Poland. "But it is not fundamentally altering the supply and demand balance in the European gas market."

Before the war, the share of Russian gas that flowed to Europe through Ukraine had fallen to around 18%. Of that, about a third goes through this particular part of the pipeline system that was shut down. That can be up to 32.6 million cubic metres a day; in recent days, it has been around 23 million cubic metres a day.

Much but not all of that gas could be rerouted through the pipeline entering Ukraine near Sudzha, said Zongqiang Luo, a gas analyst at Rystad Energy.

Even with added capacity through that town, some 10 million cubic metres per day of gas would still be in search of a pipeline route to get to Europe, and "where exactly is not clear as capacity in seemingly full," Luo said.

Over the course of a year, that daily flow would amount to around 3.6 billion cubic meters of gas, out of the roughly 150 billion cubic metres that Europe imports from Russia. It isn't a huge amount by comparison, but gas supplies are scarce, prices are high and gas importers and governments are scrambling to find all the non-Russian gas supplies they can.

WHAT'S THE IMPACT ON ENERGY USERS IN EUROPE?

Thanks to mild weather, Europe is in better shape on gas after scraping through the winter with barely adequate reserves. Reserves are filling faster than they did last year, but that needs to continue to cover demand this coming winter.

The interruption would make it harder for European countries to meet their goals for storage levels next winter and would "hasten Europe's plans to move away from imports of Russian gas," Luo said.

"As the European gas grid is well integrated, no one country is likely to suffer any immediate impact, but this will put further strain on the system and place a floor on downside price movement," Luo added.

Germany is receiving a quarter less gas through Ukraine, the Energy Ministry said Wednesday. Increased supplies from Norway and the Netherlands are partly compensating for the shortfall, said Annika Einhorn, a ministry spokeswoman.

She noted that the majority of Russian gas reaches Germany through the Nord Stream 1 pipeline under the Baltic Sea rather than via Ukraine.

WHAT ARE POSSIBLE MOTIVATIONS FOR THE MOVE?

Both Gas TSO of Ukraine and Gazprom have sought to underline their reliability as gas suppliers despite the enmity fueled by the war so analysts are still trying to figure out what the game is. Barbara Lambrecht at Commerzbank said, "It remains to be seen whether the disruption to supply turns out to be anything more than just a flexing of muscles."

Tim Ash, senior emerging markets sovereign strategist at BlueBay Asset Management, said it could be about forcing Europe's hand.

"I think frustrations are building in Ukraine that Europe is proving too slow in rolling out an energy embargo on Russia," he said. "If Europe is not prepared to shut off the energy money printing machine for Moscow, why would Ukraine not take matters into their own hands?

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