https://conservativeus.com/graphic-footage-reveals-a-ukrainian-mp-detonating-hand-grenades-at-a-community-meeting-the-reason-why-is-hidden-by-the-msm/

Unofficially, the man was an Ukrainian MP who was part of a group that works against Ukrainians that want their country to pull out of the war and wanted to remove Volodymyr Zelenskyy.