Cyber-hacks are not the only area where Russian threats are being suspected. Nato has warned Russia its violations of allied airspace “must stop” and the Danish prime minister described yesterday’s drone activity, which shut down Copenhagen airport for several hours, as “the most severe attack on Danish infrastructure so far”. Mette Frederiksen said Russian involvement could not be ruled out – to a denial from the Kremlin.

Reporter: Harry Fawcett

Producer: Melina Havoutis

Picture editor: Manos Koutsavakis

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