The scuffle happened in the metropolitan Central Officer House of the Armed Forces of Ukraine because of the raised question regarding the use of Saint George's ribbon during the 9 May events last year. The according video was published by Hromadske on Youtube.
The incident took place during the public report of veteran state service for 2016. ATO combatant Dmytro Reznichenko accused the head of "Veteran Organization of Ukraine", the MP from Communist Party in organizing events in Kyiv during which participants brought separatist Ribbons of Saint George. After the verbal exchange was over, Rezhichenko hit one of the event participants with the head. Ex-fighter was being taken out of the hall immediately, but another fight started.
It is noteworthy that the incidents due to Saint George's ribbons presence during mass events on May 8-9 are happening in Ukraine quite often.