The lack of progress at the talks in Saudi Arabia's capital, Jeddah, dashed hopes for a resolution of a conflict that has displace over 6.5 million people inside and outside Sudan.
SAF and RSF pressed on with their military campaigns that have decimated the economy, triggered ethnically driven massacres in Darfur and caused a major humanitarian crisis.
SAF has escalated its rhetoric and residents say it has intensified air strikes in the capital Khartoum, while its rival, the paramilitary RSF, has secured advances in the Darfur and Kordofan regions.
"They are firing artillery aggressively, and it often lands in civilian homes," said Ahmed Abdallah, a 51-year-old in Omdurman, a city that adjoins Khartoum where the rivals are battling over army bases.
The rival forces worked together to oust former ruler Omar al-Bashir in 2019 and stage a coup in 2021, but conflict erupted in April after for a new transition.
The talks in Saudi Arabia were first suspended in June and resumed in October.
They were adjourned this week with no new agreement, Sudanese sources at the talks said, after commitments to calm rhetoric, capture Bashir cronies, and facilitate humanitarian assistance went unfulfilled.
Representatives of SAF and RSF, who were not meeting face to face, remained at odds over the paramilitary group's occupation of much of Khartoum, the sources said.
SAF has demanded that the RSF withdraw to specific bases, they said.
The army also rejected a counterproposal by the paramilitary group that called for SAF to leave civilian homes and set up checkpoints around the city, the sources added.
A U.S. State Department spokesman said mediators remained ready for additional talks but "the parties need to demonstrate that they can implement their commitments."
On Monday, the U.S. sanctioned three Bashir-era intelligence officials over their alleged roles in fueling the conflict on both sides.
On Saturday, SAF's head General Abdel Fattah al-Burhan said in a speech to soldiers that the conflict "would not end until every inch of this country soiled by the rebellion is free."
The RSF has re-opened markets and hospitals and deployed police in Darfur, consolidating recent gains. It has also continued its expansion into the Kordofan region, which lies between Khartoum and Darfur, attacking villages and towns surrounding state capitals.
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