GENEVA — ON Tuesday, the eyes of Kenya will be firmly fixed on The Hague, where the trial of the country’s deputy president, William Ruto, and his co-defendant, Joshua arap Sang, an influential radio executive, is set to begin before the International Criminal Court. They have been charged with crimes against humanity for their alleged roles in the violence that rocked Kenya in late 2007 and early 2008. Kenya’s president, Uhuru Kenyatta, will face similar charges in a related case set for trial in November.