Uganda's President Says East African Leaders Have Agreed To Defeat South Sudan Rebel Leader if Ceasefire Offer is Rejected

Over 1,000 already killed since violence started earlier this month

(Reuters) - Uganda's president said on Monday East African nations had agreed to unite to defeat South Sudanese rebel leader Riek Machar if he rejected a ceasefire offer, threatening to turn an outburst of ethnic fighting into a regional conflict.

Two weeks of clashes have already killed at least 1,000 people in the world's newest nation, rocked oil markets and raised fears of a civil war in a region ravaged by fighting in Central African Republic and Democratic Republic of Congo.