The Islamic State group claimed responsibility for an attack on a traffic police post outside Moscow in which both of the attackers were killed.
The militant group made the claim on August 19 via the Amaq news agency, which it regularly uses to issue statements.
"Two fighters of the Islamic State assaulted Russian policemen in the Balashikha area, east of Moscow," the Amaq statement said.
Russia's Investigative Committee said two Chechens identified as Usman Murdalov, 21, and Sulim Israilov, 18, were armed with a firearm and two axes and attacked a traffic police post outside Moscow on August 17.
One of them was shot dead while attacking the post while the other was killed when he tried to put up armed resistance, investigators said.
Two police were injured in the attack, one seriously.
Russia has been bombing IS and other militants in Syria in an aerial campaign in support of President Bashar al-Assad.