Drone sightings raise Russian espionage concerns in Norway

A series of drone incidents near critical infrastructure, like oil refineries and airports, in Norway are a growing cause for alarm in the NATO-allied country. Some say they could be part of Russian efforts to spy on the country, and even a tactic of psychological warfare. The World’s host Marco Werman spoke to Bruno Oliveira Martins, a senior researcher at the Peace Research Institute Oslo, who says the country has known about the threat posed by drones for years, but has done little to prepare.