The Instagram post, which has 1.2 million likes since it was posted an hour ago, explains that McGregor was invited to the World Cup final as a guest of Putin. In his post, McGregor described Putin as "one of the greatest leaders of our time and I was honored to attend such a landmark event alongside him."
Here's the post in question.
Today I was invited to the World Cup final as a guest of Russian President Vladimir Putin. This man is one of the greatest leaders of our time and I was honored to attend such a landmark event alongside him. Today was an honor for me Mr. Putin. Thank you and congratulations on an amazing World Cup. Ð Ð¾Ñ?Ñ?Ð¸Ñ? Ð²Ð¿ÐµÑ€Ñ'Ð´!
Needless to say, McGregor's post has drawn a lot of ire from a lot of people.
Conor McGregor licking Putin's hole on Instagram is the cringest thing in seen today ðŸ˜§
— Caolan Mc Aree (@Caolanmcaree) July 15, 2018
conor, you know better. disappointing to say the least
— Miguel Ruiz (@ruizmiguel_) July 15, 2018
You may be my favorite fighter of all time but no,man, Putin is not a great leader. Unless you consider leading by fear and murder is considered great. Then yeah I guess he's great at murder.
— Shawn Coss (@ShawnCoss) July 15, 2018
Fukin hell lad.
— Danny O'Dwyer (@dannyodwyer) July 15, 2018
— DJ Swivel (@djswivel) July 15, 2018
Not sure you have a clue how many fans you just lost.
— mat burns (@MatBurnz) July 15, 2018
Just for context here, Putin has been criticised by numerous human rights organisations for everything from LGBT persecution to annexing a region of Ukraine - and, of course, being involved with the plot to see Donald Trump elected as US President.
And Conor McGregor, y'know, poses with the guy and calls him a great leader. Not ideal, in fairness.