Five candidates' names will appear on the ballot for a presidential election in Belarus on Sunday, but for the past 31 years there has only been one winner.

Belarusian President Alexander Lukashenko's youngest son, Nikolai, has been appearing ever more frequently in the media lately. The 20-year-old, who used to accompany his father on state visits, now appears to be influencing national politics.

In power since 1994, Alexander Lukashenko is assured of a new five-year term in a vote that the exiled opposition describes as a sham. It has called on Belarusians to tick a box that allows them to reject all the candidates on offer.