Unidentified drone sightings and violations by Russian jets in the skies over European nations in recent weeks have rattled NATO allies. Europe’s answer is to build a “drone wall”

It's essentially a defense system along the bloc’s eastern flank to repel unmanned aircraft from Russia, using British-made drones. 

So would it work? And how close are we to a full on NATO military confrontation with Russia?

Europe Editor James Mates tells Julie Etchingham what you need to know.