A high-altitude surveillance drone of the United States, Northrop Grumann RQ-4B Global Wak, a model that either American or NATO has often flown over Romania and the Black Sea area, performed a monitoring flight very close to the border eastern Romania, near the Republic of Moldova.
Northrop Grumman RQ-4 Global Hawk drones are unmanned aerial vehicles that fly at very high altitudes and can monitor large areas using a high-resolution synthetic aperture radar (SAR) and electro-optical sensors or infrared cameras.
The drone flies at a ceiling of 18,000 meters and has an endurance of over 32 hours.
The drone can monitor an area of over 100,000 square kilometers per day, an area comparable to Iceland for example.