LONDON — Norway has agreed to buy at least five new British anti-submarine ships in a deal valued at 10 billion pounds ($13.5 billion) as the two nations deepen their cooperation to counter Russian operations in the seas along NATO’s northern flank.

They said Sunday that Britain will supply Norway with the Type 26 frigates, creating a joint force of eight British and at least five Norwegian ships that will operate jointly in Northern Europe. The ships are built by a group of companies led by U.K.-based BAE Systems.

“Our navies will work as one, leading the way in NATO, with this deal putting more world-class warships in the North Atlantic to hunt Russian submarines, protect our critical infrastructure, and keep both our nations secure,” British Defense Secretary John Healey said in a sta

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