Sudan's paramilitary Rapid Support Forces and allies have signed a charter that paved the way for the establishment of a parallel government, as Sudan's army made advances recently against the rival groups.

The war in Sudan has killed more than 24,000 people and driven over 14 million people — about 30% of the population — from their homes, according to the United Nations. An estimated 3.2 million Sudanese have escaped to neighboring countries.

Sudan's paramilitary Rapid Support Forces and its allies have agreed to form a parallel government, they said Sunday, despite warnings such a move could further fragment the war-ravaged country. A spokesman for UN chief Antonio Guterres warned the move could "increase the fragmentation of the country and risk making this crisis ven worse".

The RSF has seized most of the western Darfur region and swathes of the Kordofan region in an almost-two-year war, but is being pushed back from central Sudan by the Sudanese army.

The formation of this administration had long been hinted from last year as Nairobi pushed for a third track to halt war in Sudan.