From what can be determined this event took place in the city of Kharkov close to the border with Russia. The crowd was generally pro-Russia and the Red ribbons and armbands signify a pro-putin, pro-communist, pro-Russia sensibility.

The young men coming from the building were Ukrainian Nationalists, or of the same ideological sympathy as the revolutionary crowds.  The ethnic divisions seem to exacerbate the issues being faced.

The video, while brutal, reflects how stark the ideological differences are within the Ukrainian people.