Britain reported tracking three Russian submarines during an alleged covert operation in the North Atlantic. Defense Secretary John Healey detailed the mission, which involved UK and Norwegian warships to monitor the area.

Britain said on Thursday it had tracked and deterred three Russian submarines on an alleged month-long “covert operation” in UK waters in the North Atlantic near vital undersea cables and pipelines. Disclosing details of the joint mission with Norway and other unspecified allies, British Defence Secretary John Healey said there was no evidence the Russian vessels had damaged the subsea infrastructure. The UK minister said he was revealing the operation, which involved British warships and...