Persephone, the robot guide, leads visitors in a Greek cave

Persephone guides visitors inside Alistrati cave in Greece, on Aug. 2, 2021. (Giannis Papanikos / AP) Persephone guides visitors inside Alistrati cave in Greece, on Aug. 2, 2021. (Giannis Papanikos / AP)

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NATO chief hails 'historic moment' as Finland, Sweden apply

NATO Secretary-General Jens Stoltenberg said Wednesday that the military alliance stands ready to seize a historic moment and move quickly on allowing Finland and Sweden to join its ranks, after the two countries submitted their membership requests.

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