The Democratic Republic of the Congo's sheer size, its political history and its myriad problems are all reasons why observers have followed its election so closely.

The vast, resource-rich country, with a population of 80 million spread over an area the size of western Europe, has never known a peaceful transition of power since its independence from Belgium in 1960.

It remains one of the poorest places in the world, racked by war and disease and with massive inequality. In the east, where scores of militia commanders battle for control of mines, an outbreak of Ebola has killed more than 300. Countrywide an estimated 4.3 million people are displaced.

It is still recovering from a civil war triggered by the fall of the dictator Mobutu Sese Seko in 1997, in which 4 million people died. Joseph Kabila has been in power as president since his father, Laurent-Désiré Kabila, the victor of that conflict, was shot dead in 2001.

The country’s problems have been exacerbated by the refusal of Kabila to leave power after the end of his second mandate two years ago, which is why December’s much-delayed election was invested with so much hope and trepidation.

Chaos at polling stations on the day of the vote dampened hopes that the election would bring a measure of political stability. The announcement by the electoral commission on 10 January that Felix Tshisekedi had won confounded polling that had put another opposition figure well in front and raised fears of a backroom deal ultimately keeping Kabila in power.

Photograph: Stefan Kleinowitz/EPA