Mediators say President Salva Kiir of South Sudan and his political rival are expected to sign a peace agreement in Ethiopia on Monday.

Representatives of Kiir and rebel leader Riek Machar have been negotiating in the Ethiopian capital of Addis Ababa since Aug. 6. The U.S. had urged the warring factions to reach a peace agreement by Aug. 17 or face sanctions.

Haile Michael, a spokesman for a regional bloc mediating the talks, said Kiir and Machar will sign what he called a "compromise document" on Monday.

Previous attempts at a negotiated settlement have failed. At stake were issues such as how to share power and the composition of a transitional government of national unity.

Many parts of South Sudan have seen war since December 2013.