Britain and Norway disclosed in April that they had uncovered a covert Russian operation in Arctic waters. US, UK and Norwegian forces intercepted Russian submarines simulating a plot to disable critical undersea cables in the Arctic. Key points and original sources are listed below.

• Britain and Norway disclosed in April that they had uncovered a covert Russian operation in Arctic waters. But the discovery of the new weapon and the location of the operation had not been reported.S1

• US, UK and Norwegian forces intercepted Russian submarines simulating a plot to disable critical undersea cables in the Arctic.S2

• Russian subs were caught in spring training in Arctic waters to unleash a secret weapon designed to clandestinely disable undersea cables.S3

• The submarines are believed to have been launched from Russia’s Arctic base (Picture: UK MOD) A joint NATO operation encountered Russian submarines attempting to destroy a vital undersea cable in the Arctic. Two Western officials told Reuters that they uncover...S4