(Time) – After a week’s delay, South Sudan’s rebel leader Riek Machar landed in the capital, Juba, on April 26, closing fears that an eight-month-old peace deal might collapse before it had a chance to end a two-and-a-half-year-long civil war marked by gruesome atrocities and tens of thousands of dead. Machar was greeted by several dignitaries and diplomats as he stepped off the United Nations plane and set foot in Juba for the first time since December 2013. “I am here to implement peace,” he told a gathering of journalists, according to tweeted reports from local correspondent@DenisDumo. But that won’t be easy.