NAIROBI, June 25 (Xinhua) -- South Sudan's President Salva Kiir on Monday left Juba for the Sudanese capital, Khartoum, to attend further talks with rebel leader Riek Machar after the two rival leaders failed to reach compromise at the recent meeting in Ethiopia.

Sudan earlier in June proposed to host meeting between the two rival leaders prior to last week's meeting in Addis Ababa on the invitation of the Ethiopian Prime Minister Abiy Ahmed who also chairs the East African bloc Intergovernmental Authority on Development (IGAD) which is mediating the South Sudan peace process to end more than four years of conflict.

The South Sudan leaders are expected to discuss outstanding issues relating to governance and security arrangements, according to the Sudanese Foreign Minister Dirdiri Mohamed Ahmed.

Another priority of the talks will be the "rehabilitation of South Sudan's economy via engaging in bilateral arrangements between Sudan and South Sudan, Ahmed added.

He said Ugandan President Yoweri Museveni will also attend the talks.

South Sudan has been suffering from a civil war since December 2013, following a conflict between President Kiir and his former Vice President Machar, which left tens of thousands of South Sudanese dead and around 4 million others displaced.