More unidentified drones were spotted over Denmark late Thursday near military airbases as a Russian landing ship, with its location responder turned off, was found loitering in waters off the Scandinavian country.
Disruptions to airport traffic started Monday night after several unidentified drones shut down airspace over Copenhagen Airport.
There was concern Russia was behind it.
The disruptions continued this week and tension was further heightened on Thursday with reports, quoting allied air command, that said Hungarian NATO fighters intercepted five Russian fighter jets over the Baltic Sea near Latvia.
The incidents unfolded against a backdrop of rising tension in Europe following a series of Russian drone incursions in Poland and Romania earlier this month, as well as the alleged