A coalition led by Saudi Arabia and its Sunni Muslim allies has been fighting the Shi`ite Houthi movement, which controls the capital, since March of last year.
The warring sides held their latest round of peace talks in December but failed to find a political solution that would end the conflict, which has killed nearly 6,000 people. Negotiations are set to resume on Jan. 14.
Former President Ali Abdullah Saleh, who retains the loyalty of the armed forces despite having stepped down from office nearly four years ago after months of protests, joined forces with the Iran-allied Houthis in fighting the Saudi-led alliance trying to shore up Hadi.
Saleh said on Friday that he would not negotiate with Hadi`s government, throwing into doubt the fate of the peace talks.
The U.N. envoy is due to travel to Sanaa soon after his Riyadh visit.
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