The Kremlin on Friday said that at least three Russians freed in a landmark prisoner exchange were undercover Russian agents, a rare public admission into the work of Moscow's top-secret security services.
Moscow said Vadim Krasikov -- who was serving life in prison in Germany for the 2019 brazen murder of a former Chechen separatist commander in broad daylight in a Berlin park -- was an elite operative with Russia's FSB security agency.
