A Russian-born U.S. citizen who was already behind bars in Russia on a bribery conviction has been handed a new 15-year sentence for espionage.

Wall Street Journal reporter Evan Gershkovich was convicted Friday of espionage and sentenced to 16 years on charges that his employer and the U.S. have rejected as fabricated.

Russian-American woman Ksenia Karelina, who was serving a 12-year prison sentence for treason in Russia, has arrived in the United States after being released as part of a prisoner exchange.

A Moscow court has on Tuesday sentenced a US citizen to 15 years in prison for espionage, according to state-run news agency RIA Novosti.

The former consulate worker, identified as Robert Shonov, was sentenced by a court in the Russian city of Vladivostok on Friday.

A U.S. citizen arrested in Russia earlier this month on drug smuggling charges was released ahead of talks in Saudi Arabia between Moscow and Washington.

In the largest prisoner exchange with Russia since 2010, four U.S. residents were released.

Ksenia Karelina, a Russian-American spa worker, was sentenced to 12 years in prison after she was found guilty of treason for donating money to a charity supporting Ukraine.

A United States citizen currently jailed in Russia on bribery charges has received an additional 15-year sentence for espionage, according to Russian media reports on Tuesday.

Wall Street Journal reporter Evan Gershkovich was convicted Friday of espionage and sentenced to 16 years on charges that his employer and the U.S. have rejected as fabricated.