Belarusians are voting in a closely-managed presidential election that is all but certain to extend the one-man rule of Alexander Lukashenko, in power since 1994 and Europe’s longest-serving leader.

Britain on Monday imposed sanctions targeting Belarusian officials and defence companies after joining Western governments in condemning what they called "sham" presidential elections in the country.

No credible opponents were allowed to run against Alexander Lukashenko, who has ruled Belarus since the 1990s.

The Central Election Commission declared Lukashenko the winner in the early hours of Monday and reaffirmed it later in the morning, saying the strongman leader garnered nearly 87% percent of the vote after a campaign in which four token challengers all have praised his rule.

Belarusian President Alexander Lukashenko won a seventh consecutive term in office Sunday in an election denounced by the European Union and the country's exiled opposition. With all his opponents in prison or living in exile abroad,