The Sunday assault on the embattled government's headquarters by its former allies has opened up a new front in the devastating civil war that has created what the United Nations says is the world's worst humanitarian crisis.
Saudi Arabia and the United Arab Emirates are the two major contributors to a military coalition that has backed President Abedrabbo Mansour Hadi since he fled into exile in 2015.
But they have struggled to keep together the disparate alliance supporting him against Shiite Huthi rebels who control the capital Sanaa and much of the north.
Many of them have been recruited into special forces units trained by the UAE to fight Al-Qaeda, which has a large presence in parts of the south.
Yesterday, those forces deployed across Aden bringing a lull in the deadly clashes that had forced a halt to the distribution of desperately needed relief supplies for days.
Saudi Arabia and the UAE have not abandoned their support for Hadi, who lives in exile in Riyadh, but they have singularly failed to intervene militarily in support of Prime Minister Ahmed bin Dagher and other ministers who are holed up under siege in the presidential palace in Aden.
The UAE has close ties to separatist Hani bin Breik, a leader in the Southern Transitional Council to which many of the forces now in control of Aden are loyal.
Both it and Saudi Arabia have urged Hadi's government to heed the separatists' grievances and called on all sides to show restraint.
At least 38 people have been killed and 222 wounded in Aden since Sunday, according to the International Committee of the Red Cross.
Even before the latest fighting, Yemen already faced the world's most serious humanitarian crisis, with some 8.4 million of its 22.2 million population at risk of famine, according to the UN.
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