The UN has criticised an agreement signed by Yemen's Houthis and former president Ali Abdullah Saleh's party to form a political council to run the country.
Farhan Haq, spokesman of UN Secretary-General Ban Ki-moon, said on Thursday the "unilateral" decision was not in line with the peace process and endangered "the substantial progress made during the Kuwait talks.
"It is a clear violation of the Yemeni constitution and the provisions of the GCC [Gulf Cooperation Council] initiatives and implementation mechanism," Haq added.
Saleh's General Peoples' Congress Party (GPC) and Ansar Allah, the political arm of the Houthi movement signed the agreement on Thursday.
The proposed council would include 10 members - five from each side.