In a region where Europe's infrastructure network and security is vulnerable to Russian attacks, the five-day NATO exercise "Playbook Merlin 25" focussed on anti-submarine warfare using advanced technologies and techniques. Submarine crews and surface forces were to be prepared for the realities of underwater operations and strengthen anti-submarine capabilities in the Baltic Sea from 10 to 14 November 2025.

With this exercise, the alliance specifically prepared for underwater conflicts and demonstrated the cooperation of the allied navies "to secure sea lines of communication, protect critical infrastructure and improve underwater warfare capabilities," NATO said in a statement.

Submarines from Sweden and Germany (U-35), a US Navy maritime patrol aircraft (P-8A Poseidon) as well as French, German, Dutch and Swedish surface ships and helicopters took part in "Playbook Merlin 25". The exercise was led by NATO's Allied Maritime Command in Northwood/UK and organised by Sweden. NATO did not name any other participants.

kdk, Stars and Stripes