The Yemeni president has accused UN envoy Martin Griffiths of siding with the country's Huthi rebels in a letter addressed to the UN chief.
Abedrabbo Mansour Hadi said he was giving Griffiths "a final chance" to implement hard-won truce deals reached in Sweden last year.
In the letter, a copy of which was obtained by AFP Friday, he accused Griffiths of "providing the Huthi militia with guarantees to stay in Hodeida and its ports under the umbrella of the UN".
"I can no longer accept these offences by your special envoy which threaten chances to find a (lasting) solution," he wrote, addressing UN Secretary-General Antonio Guterres.
The rebels' pullback from the Red Sea ports of Hodeida, Saleef and Ras Issa marked the first concrete step to implement the Sweden agreement, which was hailed as