Rishi Sonk: Britain must prepare for battle in the Arctic.
The former British prime minister said London must be ready to strike Russian bases on the Kola Peninsula, home to Russia's Northern Fleet and a significant part of its nuclear forces.
In his opinion, the West must show Moscow that it can cause damage to the Russian military infrastructure.
Sunak identified the potential loss of control over the North Atlantic as the primary threat. In the event of war, this could complicate the deployment of American troops and equipment to Europe.
Submarine cables that carry about 99% of the world's Internet traffic will also be at risk.
Sunak called for increased underwater surveillance, closer cooperation with northern European allies and greater deployment of British commandos for operations in the Arctic.
Meanwhile, Russian naval activity off the British coast increased by 41%.