This is reported by Censor.NET citing RIA Novosti. This is the first announcement by a high-profile Russian official of the exchange possibility.
"Legal possibility can be based on various rationales, based on existing bipartite, conventional, via diplomatic channels. As a rule, matters like this are being solved via diplomatic channels," the agency quoted Konovalov.
He also added that as long as the detained are accused of criminal offenses, they should be punished according to the law.