About 7 tonnes of caviar is produced in Russia legally but 95% of caviar in the retail network has illicit provenance, he said.

"Speaking about sturgeon, caviar will not be accessible. Black caviar must not be accessible, it's just not that kind of commodity. In 15 years' time, we will be able to restore the sturgeon population and then we will be able to permit fishing," he said.

"Trade in illegal black caviar and sturgeon for the Volga-Caspian basin is worth $1 billion a year, according to our information," Krainy said.