Denmark was forced to close its northern Aalborg airport on Wednesday when unidentified drones were detected in its airspace. This follows Monday’s sighting of drones close to Copenhagen’s airport. Drones were later detected near several other airports on Thursday as well.

While the source of these drones has not been formally confirmed, the unmanned aerial vehicles (UAVs) which crossed into Polish and Romanian airspace earlier this month were identified as Russian.

Meanwhile, Estonia also claimed Russian aircraft entered its airspace.

Here is a closer look at the sightings across Europe and whether Russia might be deliberately testing NATO boundaries.

Which countries have reported airspace incursions?

Denmark

Early on Thursday, Danish authorities reported that “more than one”

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