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.

Europe’s longest-serving leader won re-election in a contest widely believe to have been rigged. The result cements the power of a leader whose country is considered Russia’s staunchest ally.

Opposition leader-in-exile Sviatlana Tsikhanouskaya labeled Lukashenko’s successful reelection as “sheer nonsense.” Before Sunday’s vote, she had encouraged voters to cross out every candidate’s name on the ballot.