A video posted on line includes a clip where two Russian women living in the Kursk region saying they were told that Polish mercenaries were fighting for Ukraine.
From: Kyiv Post By Michał Kujawsk

“They are Poles, Polish mercenaries – we were told by a soldier who told us to leave our village,” say two Russian women living in the Kursk region in a popular YouTube video posted by the OSW Center for Eastern Studies:
Were they really Poles? Of course not. Russian propaganda has accustomed its people to accept baseless accusations that Russia is fighting against the collective West, and that Polish and English are the main languages heard on the front lines.
However, this isn’t the only reason why these two mentioned women claim that Polish citizens are behind this spectacular operation on Russian territory.