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The last days of August kept Polish firefighters in Skarżysko and Lublin busy. Sites belonging to a drone manufacturer and other defence companies were set aflame.

A couple of years ago, this incident would have come as a big surprise. But as Russia heats up its hybrid campaign against Nato countries, the incident in Poland is just one in a series of such events.

Just last week, a site belonging to a Ukrainian-founded drone manufacturer was nearly set on fire, had the Slovak police not foiled the attempt. Although the incident was not clearly attributed to Russia, there has been another one that was.

On Tuesday, Germany officially blamed Russia for the drones with explosive payloads that disrupted and could potentially have caused a serious accident at Leipzig airport.