It was not clear if the inspection was linked to the nerve agent poisoning in Britain of former Russian double agent Sergei Skripal and his daughter, Yulia, or if it was routine.
The OPCW, headquartered in The Hague, has been involved in the Skripal investigation and an English court last month gave its experts permission to test blood samples taken from the Skripals. OPCW inspectors are also looking into the toxin used in the attack.
The Russian Defence Ministry's official newspaper, Krasnaya Zvezda (Red Star), on Friday published a graphic showing events over the past week which included a mention of a visit to Russia by an "inspection group of the Technical Secretariat of the OPCW."
It provided no further details.
Moscow denies any involvement in the attack and says it has no stocks of "Novichok" or any other chemical weapon. A diplomatic row has flared up over the case, with scores of diplomats expelled in multiple countries.
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