The ongoing civil war in Sudan has provoked one of the world's worst humanitarian crises in decades, the international chief of medical charity Doctors Without Borders (MSF) said Thursday.

War has raged for more than a year between the regular military under army chief Abdel Fattah al-Burhan and the paramilitary Rapid Support Forces led by his former deputy, Mohamed Hamdan Daglo.

"Sudan is one of the worst crises the world has seen for decades ... yet the humanitarian response is profoundly inadequate," said Christos Christou, international president of the charity.