Britain, Norway and the United States disrupted a Russian undersea operation near Norway's Svalbard archipelago this spring, according to Western officials cited by Reuters.
The officials say Russian submarines were testing technology designed to disable critical undersea cables without clearly revealing who was responsible.
The vessels were tracked and confronted at sea before leaving the area, and no cables were damaged.
Britain had previously disclosed that it tracked Russian submarines linked to Moscow's deep-sea warfare directorate, known as GUGI, during a month-long operation.
Russia denies conducting sabotage operations against NATO countries or preparing for a confrontation with the alliance.
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