One of the most shocking moments - and there were many - during the UFC 229 brawl on Saturday night was the moment a guy in a red shirt scaled the walls of the octagon before punching Conor McGregor.It was an unprovoked attack on the Irishman, who had just been defeated by Khabib Nurmagomedov.Nurmagomedov had sparked the brawl inside the T-Mobile Arena moments earlier after climbing out of the octagon and launching an attack on Dillon Danis, McGregor’s ju-jitsu partner.Seconds later, a man wearing a red shirt leapt over the octagon and punched McGregor from behind several times.Many UFC fans on social media described the attack as cowardly and it’s easy to see why.The man in question is Zubaira Tukhugov, a Russian mixed martial artist of Chechen descent who formerly fought in the Featherweight division of the UFC.You can watch the footage here...The 27-year-old, who was due to fight McGregor’s teammate Artem Lobov later this month, has now caused a stir with comments about the attack on social media.Tukhugov has posted a video online in which he brags about the attack on McGregor."I slapped him as promised,” the Russian is quoted as saying by the Mirror. “I promised to make him answer for his words and I did."

Tukhugov, who attacked McGregor along with another member of Nurmagomedov's team, has doubled down. He’s clearly in no mood to offer any sort of apology to McGregor for his actions.

However, one possible reason why Tukhugov attacked McGregor has been uncovered.

McGregor previously accused Tukhugov of treating for turning on fellow Chechen Lobov in September - and this is said to be the reason for the attack.

"Everyone who thinks I missed, show me where,” he added on the video.

"There is nothing. Just cop pushed me back on the video, as if I missed. Not even close.

"Everyone who thinks I missed, I swear, nothing was too close."

Needless to say, his comments have sparked a reaction on social media...

It’s unclear whether Tukhugov was one of those arrested inside the arena - three members of Nurmagomedov’s team were arrested for their part in the melee - but it’s inevitable that he will face disciplinary action following his sucker punch on McGregor.

It’s also certain that he will never fight again in UFC.

"The guys who jumped in will never fight here again,” UFC president Dana White has already announced.

"I've been working hard to promote this sport, this is not what a mixed martial arts event is normally like."