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STAVANGER, Norway (AP) — Norwegian oil and gas workers normally don’t see anything more threatening than North Sea waves crashing against the steel legs of their offshore platforms. But lately they have noticed a more troubling sight: unidentified drones buzzing in the skies overhead.
With Norway replacing Russia as Europe's main source of natural gas, military experts suspect the unmanned aircraft are Moscow's doings. They list espionage, sabotage and intimidation as possible motives for the drone flights.
The Norwegian government has sent warships, coastguard vessels and fighter jets to patrol around the offshore facilities. Norway's national guard stationed soldiers around onshore refineries that also were buzzed by drones.
Prime Minister Jonas Gahr Støre has invited the navies of NATO allies Britain, France and Germany to help address what could be more than a Norwegian problem.
Precious little of the offshore oil that provides vast income for Norway is used by the country's 5.4 million inhabitants. Instead, it powers much of Europe. Natural gas is another commodity of continental significance.
“The value of Norwegian gas to Europe has never been higher,” Ståle Ulriksen, a researcher at the Royal Norwegian Naval Academy, said. “As a strategic target for sabotage, Norwegian gas pipelines are probably the highest value target in Europe.”
Closures of airports, and evacuations of an oil refinery and a gas terminal last week due to drone sightings caused huge disruptions. But with winter approaching in Europe, there is worry the drones may portend a bigger threat to the 9,000 kilometers (5,600 miles) of gas pipelines that spider from Norway's sea platforms to terminals in Britain and mainland Europe.
Since the start of the war in Ukraine in late February, European Union countries have scrambled to replace their Russian gas imports with shipments from Norway. The suspected sabotage of the Nordstream I and II pipelines in the Baltic Sea last month happened a day before Norway opened a new Baltic pipeline to Poland.
Amund Revheim, who heads the North Sea and environment group for Norway's South West Police force, said his team interviewed more than 70 offshore workers who have spotted drones near their facilities.
“The working thesis is that they are controlled from vessels or submarines nearby,” Revheim said.
Winged drones have a longer range, but investigators considered credible a sighting of a helicopter-style bladed model near the Sleipner platform, located in a North Sea gas field 250 kilometers (150 miles) from the coast.
Norwegian police have worked closely with military investigators who are analyzing marine traffic. Some platform operators have reported seeing Russian-flagged research vessels in close vicinity. Revheim said no pattern has been established from legal marine traffic and he is concerned about causing unnecessary, disruptive worry for workers.
But Ulriksen, of the naval academy, said the distinction between Russian civilian and military ships is narrow and the reported research vessels could fairly be described as “spy ships.”
The arrest of at least seven Russian nationals caught either carrying or illegally flying drones over Norwegian territory has raised tensions. On Wednesday, the same day a drone sighting grounded planes in Bergen, Norway’s second-biggest city, the Norwegian Police Security Service took over the case from local officers.
“We have taken over the investigation because it is our job to investigate espionage and enforce sanction rules against Russia,” Martin Bernsen, an official with the service known by the Norwegian acronym PST. He said the “sabotage or possible mapping” of energy infrastructure was an ongoing concern.
Støre, the prime minister, warned that Norway would take action against foreign intelligence agencies. “It is not acceptable for foreign intelligence to fly drones over Norwegian airports. Russians are not allowed to fly drones in Norway,” he said.
Russia’s Embassy in Oslo hit back Thursday, claiming that Norway was experiencing a form of “psychosis” causing “paranoia.”
Naval academy researcher thinks that is probably part of the plan.
“Several of the drones have been flown with their lights on,” he said. “They are supposed to be observed. I think it is an attempt to intimidate Norway and the West.”
The wider concern is that they are part of a hybrid strategy to both intimidate and gather information on vital infrastructure, which could later be targeted for sabotage in a potential strike against the West.
“I do not believe we are heading for a conventional war with Russia,” Ulriksen said. “But a hybrid war … I think we are already in it.”