Chalong police were called about the crash at 1am.
Paramedics found the body of the man lying on the footpath that surrounds the lagoon at Nai Harn, a popular spot for dog-walking and cycling in southern Phuket.
Officers learned that the man had crashed his Honda into the footpath soon after leaving the Reggae bar about 1am.
The motorcycle was an automatic ride and that may have added to the Russian's problems in maintain control, police said. He appeared to have hit the curb then his head hit the pavement, breaking his neck.
The man was not wearing a safety helmet. Deaths in single-vehicle motorcycle crashes sometime after the riders leave bars are not unusual on Phuket.
Phuketwan has been supplied with the man's name but will not publish it until we can be sure his relatives have been notified.
Details on the road toll on Phuket are no longer provided by local authorities.