A rebel leader in South Sudan says he will not return to his country because the government has violated a peace accord signed last August.

Riek Machar told reporters Tuesday that he hopes Ugandan President Yoweri Museveni will use his influence with South Sudan's government to ensure the agreement is implemented. South Sudan President Salva Kiir recently announced the creation of 28 new states, a move which Machar and others said was against the peace accord.

Machar is currently in Uganda to consult with Museveni, who deployed Ugandan special forces to back Kiir at the start of the conflict in December 2013.

A U.N. panel of experts says in a new report that both Kiir and Machar should be sanctioned because their troops have targeted civilians.