Poland and Romania are deploying a new weapons system to defend against Russian drones, following a spate of incursions into NATO airspace in recent months that exposed the alliance’s vulnerabilities and put Europe on edge.

The American Merops system, which is small enough to fit in the back of a midsize pickup truck, can identify drones and close in on them, using artificial intelligence to navigate when satellite and electronic communications are jammed.

“The reason we are using it is it is one of the best systems that we have information on right now to kill those one-way attack drones,” said Brigadier General Curtis W. King, Commanding General, 10th Army Air and Missile Defense Command of the U.S Army.

"It's very effective, very lethal, it's very low on the number of soldiers or military person that have to be able to operate it, but it's much more cost-effective”, he added.

As well as being deployed in Poland and Romania, Merops will also be used by Denmark, NATO military officials told The Associated Press, part of a move to boost defenses on the alliance’s eastern flank.

The aim is to make the border with Russia so well-armed that Moscow’s forces will be deterred from ever contemplating crossing, from Norway in the north to Turkey in the south, the officials said.

The need for such technology became acute after around 20 Russian drones flew into Polish airspace in early September. Multimillion-dollar jets were scrambled to respond to drones which cost tens of thousands of dollars.

Romania later faced a drone incursion, while drones temporarily closed airports in Copenhagen, Munich, Berlin and Brussels. There were also sightings near military bases in Belgium and Denmark.

AP Video by Rafal Niedzielski