Representatives from all ten Nordic countries that make up the Joint Expeditionary Force (JEF) will sign an agreement on November 10 to pool their navies to deter Russian aggression.
JEF members include the UK, Denmark, Estonia, Finland, Iceland, Latvia, Lithuania, the Netherlands, Norway and Sweden.
The new agreement is expected to be signed on board the Royal Navy's aircraft carrier HMS Prince of Wales (R09) ahead of the warship's future Atlantic Forum conference.
The agreement will see the UK-led JEF move from "memorandums of understanding, information sharing and consultation" to practical action.
The increased presence of European countries in the region is seen as a response to Trump's call for the Nordic countries to take greater responsibility for their defense, given that vital submarine cables pass through the region.