An officer of Russia's Black Sea fleet and his partner have been imprisoned on charges of spying for Ukraine, Russia's Federal Security Service (FSB) said on February 28.

Russia's North Caucasus Regional Military Court sentenced Major Dmitry Dolgopolov to 10 years in prison and Anna Sukhonosova to 9 years after convicting the couple of selling classified materials to Ukraine's intelligence, according to RFE/RL.

Both the FSB and the Russian military court described Sukhonosova as Dolgopolov's "common-law wife."

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"The named individuals collected and handed to Ukraine’s Security Service materials containing state secrets on operations of units of the Black Sea Fleet," an FSB statement said.

The FSB statement said the couple pleaded guilty.

The Security Service arrested the two in the occupied Crimea back in September 2017.