I wasn’t fully convinced before that Putin has Trump in his pocket, but after that stunt, I am convinced that he is under Putin’s thumb. Trump and co. could have had marching orders from Putin to do exactly that. Also, this is something that Putin have done and would do, publicly humiliating someone on live TV.
Remember during the first Trump era when he was meeting international leaders and doing that stupid teenage douche power pull handshake?
It’s a continuation of the same ideas. Trump has always inflated himself in similar ways in public settings and will do so until he is dead.