According to the portal, the incident occurred on December 7 in Bydgoszcz, when the artists began to perform a Cossack dance with sabers.
Two men jumped onto the stage and unfurled banners with anti-Russian slogans and began chanting "Hands off Ukraine."
After that, the guards brought the men out of the scene, but the unknown continued to hold banners in the lobby, and then outside.
In November 2017, the Ukrainian nationalists disrupted the performance of Konstantin Raikin in Odessa.