Islamist militants backed by armed drones raided an army base in Nigeria's northeastern Borno state, killing several troops in the early hours of Thursday, the military said, in the second assault reported there this week.

Smoke has been seen over the port and oil depot in Feodosiia following explosions, while schools have been closed and internet disruptions reported.

A demonstration of Auterion's Nemyx showing drones controlled by one operator hitting multiple targets showcases a capability which may be deployed later this year.