NATO ally upgrades helicopters to hunt Russian submarines at night

Sweden is rolling out new technology in its military across the Baltic Sea, in a move that could up the Nordic country's—and NATO's—ability to track Russian submarines close to the alliance's territory.

Earlier this month, Sweden's military announced that its navy had carried out drills using helicopters able to detect submarines at night or during poor weather conditions. The exercises were held around the Stockholm archipelago and the Gotska island in the Baltic Sea for a week from October 11, and "the new capability was included for the first time in a larger exercise," Sweden's armed forces said.