But the French Foreign Ministry has said it is up to the judge in the case to decide whether Kerimov will be protected by his diplomatic status.
According to Nice's public prosecutor Jean-Michel Pretr, French prosecutors have brought tax evasion and money laundering charges against the Russian lawmaker. "That's why the energetic work on defending Suleiman Kerimov's interests will continue", TASS cited Peskov as saying.
The Kremlin spokesman noted that the Russian Foreign Ministry is carrying out an intense effort in connection with the incident.
Shares in Polyus, Russia's biggest gold producer which is controlled by Kerimov's family, fell on the news of his detention.
Forbes magazine listed Kerimov as Russia's 21st richest person with a net worth of about $6.7 billion.
Kerimov shot to fame in the soccer world in 2011 when he bought Russian club Anzhi Makhachkala and went on a spectacular spending spree.
Kerimov, 51, spent a second night Tuesday at a police station in the southern resort city, where he was arrested on arrival at the airport on Monday night, legal sources said.
A source said the investigation centres on the purchase of several luxury residences on the French Riviera via shell companies, something that would have enabled Kerimov to reduce taxes owed to the French State.
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