I am not surprised this has happened, especially to a Russian.
I witness on a daily basis the horrendous way they behave - like wild pack of hyenas and that's just the kids!!!
I'm not excusing the security thugs actions if indeed excessive force was used, as they are well known for their ruthless behavior all across Thailand.
It was just only a matter of time before one of them got their head kicked in, and well, here we are... Next time Ruskie, just sit down, drink your drink quietly and try to crack a smile while your at it!