London — Britain is sending anti-drone equipment and personnel to Belgium after a spate of sightings near airports and military bases, the head of the U.K. military said Sunday.

While Belgium and the U.K. have not accused anyone of flying the unidentified drones, they're the latest in a growing trend of airspace violations by mysterious aircraft in about half of a dozen European nations, including around NATO military bases, that at least one U.S. ally calls part of escalating Russian "hybrid warfare."

In the past week Belgium's main international airport in Brussels and one of Europe's biggest cargo airports, near the Belgian city of Liege, were forced to close temporarily because of drone incursions. Before that, authorities reported a series of unidentified drone flights near a mil

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