Alexander Lukashenko, Europe’s longest-serving leader, has extended his 31-year rule in Belarus after being declared the winner of a presidential election that his exiled opponents and Western countries have denounced as a sham.

Alexander Lukashenko, who has ruled the ex-Soviet state for 31 years, held a four-hour press conference musing that some of his opponents "chose prison", after winning 88 per cent of the vote.

Alexander Lukashenko was declared the landslide winner of presidential elections in Belarus. His victory was seen as a foregone conclusion in a country he's run for more than 30 years.