The fight began between MPs from the president's Petro Poroshenko Bloc (PPB) and Yatsenyuk's People's Front (PF).
It allegedly all started when Oleg Barna (PPB) went up to the tribune while Yatsenyuk was giving a speech, presented him a bouquet of roses and then tried to carry him off the stage.
Barna's actions led to a fight that disrupted the PM's speech.
The brawl continued for several minutes involving members from both parties, although some were clearly confused, as seen in the video. When everyone had calmed down, representatives from both the PPB and PF apologized.
“Please, I'm not upset," Yatsenyuk said while addressing the PPB speaker, “so there are lots of morons - let's finish with the questions to the government."
Oleg Barna was excluded from the Rada later that day.
Fisticuffs in the Ukrainian parliament are far from infrequent. In fact fights break out so often they have fueled a meme called 'Accidental Renaissance', when ugly fights in the Rada are depicted in photos resembling Italian art due to their perfect proportions.