New Delhi, Nov. 7 -- The deployment in Poland and Romania of a new weapons system to defend against Russian drones follows several recent incursions into NATO airspace. The Merops system can identify drones, which are hard to detect on traditional radar systems, and counter them cost-effectively.

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...