The European Union on Wednesday promised a "robust" response to any intentional disruption of its energy infrastructure after saying it suspected sabotage was behind gas leaks discovered this week on subsea Russian pipelines to Europe.
As gas spewed out under the Baltic Sea for a third day after first being detected, it remained far from clear who might be responsible for any sabotage of the Nord Stream pipelines that Russia and European partners spent billions of dollars building.
Russia, which slashed gas deliveries to Europe after the West imposed sanctions over Moscow's invasion of Ukraine, has also said sabotage was a possibility.
"Any deliberate disruption of European energy infrastructure is utterly unacceptable and will be met with a robust and united response," the EU foreign policy chief Josep Borrell said.
Echoing the views of Germany, Denmark, and Sweden, he said sabotage was likely, although the EU has not named a potential perpetrator or suggested a motive. Washington, which has led efforts to punish Moscow over the war, believes its too soon to conclude there was sabotage, a senior U.S. military official said.
"The jury is still out," the official told repoters. "Many of our partners, I think, have determined or believe it is sabotage. I'm just -- I'm not at the point where I can tell you one way or the other." Asked whether any U.S. involvement in the ruptures could be ruled out, the U.S. military official said: "We were absolutely not involved."
The U.N. Security Council will convene on Friday at the request of Russia to discuss damage to the pipelines, the French U.N. mission, which holds the presidency of the 15-member council for September, said.
Russia's embassy in Washington said Moscow had asked for the meeting as it "insists on the need for a comprehensive and objective examination of the circumstances of the unprecedented attacks on Russian pipelines."
The embassy, in an early Thursday statement on its Telegram channel, also accused the United States of attempts to "squeeze out" Russia from the energy market through "non-market methods and sanctions."
The Nord Stream pipelines have been flashpoints in an escalating energy war between capitals in Europe and Moscow that has damaged major Western economies and sent gas prices soaring.
SECURITY ALERT
Denmark's defense minister said after a meeting with NATO General Secretary Jens Stoltenberg there was reason to be concerned about the security situation in the region.
"Russia has a significant military presence in the Baltic Sea region, and we expect them to continue their saber-rattling," Morten Bodskov said in a statement.
Norway's prime minister said on Wednesday that its military will be deployed near oil and gas installations, while Denmark is raising its level of preparedness.
"The military will be more visible at Norwegian oil and gas installations," Norway's Jonas Gahr Stoere told a news briefing.
In the Baltic Sea, gas was still bubbling from the Nord Stream 1 pipeline, the Swedish Coast Guard said in an email.
The Danish Energy Agency said more than half the gas in the damaged pipelines had left the pipes and the remaining volume was expected to be gone by Sunday.
Jens Schumann, managing director of gas pipeline grid company Gasunie Deutschland, said he was "relatively optimistic" that the damage could be repaired.
"There are good teams in place to handle pipeline accidents, there are emergency pipe inventories and experts for onshore and offshore," Schuman said.
But German security agencies fear that Nord Stream 1 will become unusable if large volumes of salt water flow into the pipes and cause corrosion, German newspaper Tagesspiegel reported, citing government sources.
The Danish armed forces said the largest gas leak caused a surface disturbance of more than 1 kilometer (0.6 mile) in diameter, as agencies issued warnings to shipping.
Sweden's Prosecution Authority said it will review material from a police investigation and decide on further action, after Swedish Prime Minister Magdalena Andersson said on Tuesday that two blasts had been detected.
Although this did not represent an attack on Sweden, Stockholm was in close contact with partners such as NATO and neighbors such as Denmark and Germany, Andersson said.
Seismologists in Denmark and Sweden said they had registered two powerful blasts on Monday in the vicinity of the leaks, and the explosions were in the water, not under the seabed.
U.S. Defense Secretary Lloyd Austin offered Washington's support in a call with his Danish counterpart on Wednesday, a senior U.S. defense official said. The State Department said it was sharing information on the blasts with its allies.
GAS FLOWS
Operator Nord Stream has called the damage "unprecedented," while Russian-controlled Gazprom, which has a monopoly on gas exports by pipeline, declined to comment.
While neither pipeline was delivering gas to Europe at the time, the incidents scupper any remaining expectations that Europe could receive fuel via Nord Stream 1 before winter.
"A development that could have a more immediate impact on gas supplies to Europe was a warning from Gazprom that Russia could impose sanctions on Ukraine's Naftogaz due to ongoing arbitration," analysts at ING Research said.
Naftogaz's CEO said on Wednesday the Ukrainian energy firm will continue with arbitration proceedings against Gazprom over Russian natural gas which transits the country.
Gazprom said earlier in the week that while rejecting all Naftogaz's claims in arbitration, it may introduce sanctions against the company in case it presses ahead with the case.
European gas prices rose following news of the leaks. The benchmark October Dutch price was up by 11% at 204.50 euros/megawatt hour on Wednesday. Although prices are still below this year's peaks, they remain more than 200% higher than in early September 2021.
Russia reduced gas supplies to Europe via Nord Stream 1 before suspending flows altogether in August, blaming Western sanctions for causing technical difficulties. European politicians say that was a pretext to stop supplying gas.
The new Nord Stream 2 pipeline had yet to enter commercial operations. The plan to use it to supply gas was scrapped by Germany days before Russia began what it calls a "special military operation" in Ukraine in late February.
(Reporting by Reuters bureaus; Writing by Alexander Smith; Editing by Louise Heavens, Elaine Hardcastle and David Evans)
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