Some of it was espionage, where they are charting a lot of things. Some of it, I think, was positioning in case of a war or a deep crisis.
Military analysts have concluded those drones may have been on a state-sponsored surveillance mission, according to one U.S. official familiar with the incidents.
Experts said the drones' presence was indicative of a so-called hybrid or gray zone attack against the West, where a range of tactics are used to covertly attack or destabilize an enemy.
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