Danish President Mette Frederiksen: "“I think we are in the most difficult and dangerous situation since the end of the Second World War,”

A drone wall? I think it's likely some sort of jamming device that stops all drones from functioning in NATO airspace. The only problem with something like this is that ALL drones might fall out of the sky along with Russian ones. They idea I believe would be to jam two way communication with the drones and possibly to jam it's communication with itself making it only crash. However, if it is a suicide drone it might blow up whatever it fell on when it crashed too.

Also, this much jamming of this kind also might not be good for human bodies to get in the way of too. But, I think jamming likely will go on wherever Russian (or any drones) appear in the sky now.

Also, this sort of jamming device might interfere with Aircraft to Aircraft communications too like passenger jets or military jets. So, it is a work in progress at best. 

 begin partial quotes from:

A 'drone wall'? Europe floats a high-tech response to Russian threats

“I think we are in the most difficult and dangerous situation since the end of the Second World War,” she added. “I want us to rearm. I want us to buy more capabilities. I want us to innovate more.”

The advent of advanced, low-cost drones has transformed the landscape of war and security, helping Ukraine to match its far larger adversary but also leaving Western powers scrambling to adjust.

NATO launched an initial effort to bolster its flank last month after Poland shot down Russian drones that had violated its airspace. Renewed reports of drone sightings from Germany to Sweden have fueled pressure to do more.