Several explosions were reported in Crimea, near the village of Novofedorovka.
There is a military airfield located in the vicinity of the village.
The first explosion occurred at about 15:00 local time. Several others followed soon afterwards.
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No other details have been provided yet.
According to local residents, there were six explosions in total.
Advisor to the head of Crimea Oleg Kryuchkov urged everyone to wait for official information.
"So far I can only confirm the very fact of several explosions in the Novofedorovka area. I urge everyone to wait for an official announcement and refrain from spreading fake news," the official said.
NATO has no plans to deploy troops on the Ukrainian territory, Jens Stoltenberg said. French President Emmanuel Macron earlier did not rule out a possibility to send Western military forces there