WASHINGTON (AP) — Secretary of State John Kerry is bringing his two main tools of diplomacy — peace talks and threatened sanctions — to Africa this week to try to find a way to end months of killing that is threatening to rip apart South Sudan, the world's newest nation.

It's not yet clear whether the U.S. will impose the sanctions while Kerry is in South Sudan, which he said he planned to visit during a week of stops that also include Ethiopia, the Democratic Republic of Congo and Angola.

U.S. officials are still trying to persuade three of South Sudan's immediate neighbors to issue similar penalties against people on both sides of the brutal fighting.

Kerry arrives in the Ethiopian capital of Addis Ababa on Wednesday.