East Africa's leaders have said they would not accept a violent overthrow of the government in South Sudan, where more than 1,000 people are believed to have died in recent clashes.
|The leaders of Ethiopia, South Sudan and Kenya met in Juba on Thursday|
Kenya's president also called for an immediate end to the fighting and for talks with both sides.
The UN is sending extra peacekeepers to the world's newest country.
The clashes come amid a power struggle between President Salva Kiir and his former deputy, Riek Machar.
There are reports of mass killings along ethnic lines, targeting both members of Mr Kiir's Dinka ethnic group and Mr Machar's Nuer community.
The fighting has forced more than 100,000 to flee their homes, with about 60,000 seeking refuge at UN compounds across the country, UN officials say.