Denmark deploys ‘saildrones’ in Baltic to protect undersea cables from Russia

US-made unmanned vessels will monitor maritime activity as part of trial, amid criticism over closer ties with America

Denmark is deploying floating drones on the Baltic Sea to protect undersea infrastructure and bolster maritime surveillance amid the growing threat of hybrid attacks from Russia.

The arrival of Saildrone, a California-based company, has prompted criticism in Denmark over forging tighter bonds with the US in such a sensitive area as digital security.