South Sudan's President Salva Kiir has reshuffled the ruling party's senior leadership amidst fresh fighting and speculation about succession plans. Prominent ally, Second Vice President Benjamin Bol Mel,

Sudan’s army says it may be forced to shut down facilities used to export oil from South Sudan as a result of the war.

"The United States calls on the government of Sudan to cease all chemical weapons use and uphold its obligations under the CWC," the statement read, referring to the Chemical Weapons Convention under which signatories have committed to destroy their stockpiles of the weapons.

South Sudan’s authorities have yet to bring to justice those responsible for brutal and fatal attacks on civilians three years ago in southern Unity state.

Landlocked South Sudan relies on Sudan to export its crude oil, shipping it through Port Sudan on the Red Sea in exchange for transit fees. Exports had only recently resumed after nearly a year of suspension due to pipeline damage from earlier fighting.

Senior Fellow for Africa Policy Studies and former ambassador Michelle Gavin breaks down the tense U.S.-South Africa meeting at the White House.