South Sudan President Salva Kiir on Wednesday called on rebels to resume peace talks as the country marked its third birthday with celebrations overshadowed by fighting that has killed thousands and brought it to the verge of famine, Reuters reported. In a swift response, rebel leader Riek Machar told Reuters in Ethiopia that he was ready to resume dialogue but warned his troops would target South Sudan's oil installations if fighting resumed and the government used oil revenues to buy arms. Clashes erupted in the capital Juba in December pitting the government forces of Kiir against supporters of Machar, his former deputy and long-time rival. The conflict has reopened deep ethnic tensions in the world's youngest country, which only won independence from Sudan in 2011.