Rishi Sunak, a Conservative MP, produced a report for the Policy Exchange think-tank in which he warned that Russia is "aggressively operating" in the Atlantic, where cables link Europe and the US.

In the foreword to the report, retired US Navy Admiral James Stavridis claimed: "Russian submarine forces have undertaken detailed monitoring and targeting activities in the vicinity of North Atlantic deep-sea cable infrastructure."

source: a related article, from Jan 2018