Russia and other hostile states have become increasingly brazen in adopting “gray zone” attacks against Europe and the United States, leaving defense officials with a dilemma: How to respond?
When mysterious drones began appearing over oil rigs and wind farms off Norway’s coast about three years ago, officials were not certain where they came from.
But “we knew what they were doing,” Stale Ulriksen, a researcher at the Royal Norwegian Naval Academy, said in a recent interview. “Some of it was espionage, where they are charting a lot of things. Some of it, I think, was positioning in case of a war or a deep crisis.”
The drones were suspected of being launched from Russian-controlled ships in the North Sea, Mr. Ulriksen said, including some ships that were near underwater energy pipelines. Norway could not do much to stop them, he added, given that they were flying over international waters.
In recent weeks, reports of drone swarms over the United States’ East Coast have brought fears of hybrid warfare to widespread attention. Only 100 out of 5,000 drone sightings there required further examination, U.S. officials said, and so far none are believed to have been foreign surveillance drones. But it is a different story for the drones spotted in late November and early December over military bases in England and Germany where American forces are stationed.
Military analysts have concluded those drones may have been on a state-sponsored surveillance mission, according to one U.S. official familiar with the incidents, who spoke on the condition of anonymity to discuss an open investigation. British and German defense officials declined to discuss details of the sightings.
Experts said the drones’ presence was indicative of a so-called hybrid or “gray zone” attack against the West, where a range of tactics — military, cyber, economic and even psychological — are used to covertly attack or destabilize an enemy.