Sharjah 24 – AFP: Turkey's Recep Tayyip Erdogan was on Saturday sworn in for a third term as president, promising to serve "impartially" after winning a historic runoff election to extend his two-decade rule.

The inauguration in parliament will be followed by a lavish ceremony at his palace in the capital Ankara attended by dozens of world leaders.

Turkey's transformative but divisive leader won the May 28 runoff against a powerful opposition coalition, despite an economic crisis and anger over a February earthquake that killed more than 50,000 people.

Erdogan won 52.18 percent of the vote while his secular rival Kemal Kilicdaroglu scored 47.82 percent, official results show.

In his oath, Erdogan also promised not to deviate from the rule of law and the secular principles of the republic founded by Mustafa Kemal Ataturk 100 years ago.

Turkey's longest-serving leader now faces significant immediate challenges in his third term, including the slowing economy and tensions with the West.