"Three people convicted in Russia as Georgian intelligence agents were freed recently," deputy foreign minister David Zalkaliani told a news conference, but declined to give further details.
Relations between Tbilisi and Moscow have thawed since the fervently pro-Western former Georgian president Mikheil Saakashvili's administration was replaced in 2013 by the Georgian Dream coalition's government.
Georgia's new leaders have said Tbilisi will try to mend ties with the Kremlin while pursuing its bid for full membership in the European Union and NATO.
Arrested in Russia in 2008, Kherkeladze was convicted in 2010 of espionage for Georgia and given an 11-year jail term.
As part of a major amnesty in January 2013, Georgia released several people -- including three Russians -- who were convicted of spying for Moscow.
Georgia's pro-Western policies have infuriated its Soviet-era master Russia since the small Caucasus nation regained independence with the Soviet Union's collapse in 1991.