The United Nations' special envoy for Yemen is discussing a peace plan with both sides in the conflict during his second visit to the capital Sana'a in less than a week.

The U.N. said in a statement Friday that Ismail Ould Cheikh Ahmed arrived in the capital on Thursday and that he will meet with members of the diplomatic corps and others to discuss ways to alleviate the humanitarian suffering and assess the best ways to address the country's economic crisis.

"Negotiating peace frameworks is a tremendous undertaking under the best of circumstances," added the Special Envoy. "It requires an unequivocal determination of the parties to reach a negotiated settlement to put Yemen on the path to peace and that's what we are aiming for."