UN envoy to Yemen Martin Griffiths arrived on Monday in Sanaa for talks aimed at halting military escalations in the coastal city of Hudaida.
The United Nations envoy for Yemen arrived in Sanaa on Monday for another round of talks aimed at finding a solution to fighting in the key rebel-held port city of Hudaida.
Martin Griffiths is set to meet with Yemen's Houthi rebels, who control the capital along with the Red Sea city of Hudaida, home to the country's most valuable port.
He did not make a statement upon his arrival at the Yemeni capital's international airport.
Two weeks of UN-brokered talks have not yet found a solution to the Saudi-led government offensive on Hudaida, backed by the United Arab Emirates and its allies in a Saudi-led regional coalition supporting President Abd Rabbu Mansour Hadi.
The Hudaida offensive has raised fears for civilians in a country already devastated by years of war between the Iran-backed Houthis and Hadi's Gulf-backed government.
The United Arab Emirates said on Sunday it had halted the offensive to give a chance to UN diplomatic efforts.
Hudaida's port is the entry port for some 70 percent of imports to Yemen, where as many as eight million people face imminent famine.
Both the UAE and the Hadi government have held firm to their rejection of anything short of a full Houthi withdrawal.
Griffiths has said a proposal to grant the UN a major role in managing the port was being studied.
The UN envoy met with Hadi in the southern city of Aden on Wednesday and is reported to be pushing for the Houthis to cede control of Hudaida offensive to the UN.
He was also in Oman on Thursday, where he met top rebel negotiator Mohammed Abdulsalam, UN radio reported.
The Houthis have controlled Hudaida and its port since 2014, when they also drove the Hadi government out of the capital and seized large swathes of northern Yemen.
That sparked a Saudi-led intervention to prop up Hadi's government, since which some 10,000 people have died.
The recent Saudi-led offensive for Hudaida has claimed 429 lives, according to military and medical sources.
There are no confirmations of civilian casualties, although the UN has documented thousands of residents fleeing combat zones.
The UN has called Yemen the world's largest humanitarian crisis.