She did not elaborate and could not say whether the Pole has left Russia. The neighbors have had strained relations. Russia's business daily Kommersant reported that the expulsion came after Poland recently expelled Russia's deputy consul in Poznan.
Last year Poland expelled four Russian diplomats in a gesture of solidarity with Britain, which has charged two Russians with attacking a former Russian spy, Sergei Skripal, and his daughter with a nerve agent in Salisbury. Moscow denies involvement.