Ukraine unsuccessfully attacked a Russian warship in the Black Sea, Russia's defense ministry said.
Russia said Ukraine used six unmanned boats to try and attack the ship on Sunday.
The Black Sea peninsula was invaded by Russian forces and illegally annexed by Putin in 2014.
At the time of Ukraine's attempted attack, an American RQ-4 Global Hawk unmanned surveillance aircraft was in the central part of the Black Sea, the ministry's statement added.
In May, a Russian warship, the Ivan Khurs, was attacked by three unmanned speedboats in the Black Sea.
Persons:
—, Ukraine's, Ivan Khurs
Organizations:
Service, Russian, Ukrainian Armed Forces, Reuters, Russia's Defence Ministry, Russian Defence Ministry
Locations:
Ukraine, Russian, Russia, Moscow, Ukrainian, Sevastopol —, American, Europe, Turkey, Black