Why was it common for explorers to work for kings and queens of different countries?

The photograph shows sudanese president omar al-bashir. the international criminal court has been unable to prosecute al-bashir for war crimes because it cannot a) launch a search for him inside sudan. b) arrest him due to the court’s limited authority. c) issue an arrest warrant until sudan gives it permission. d) step in until the un security council refers the case to the court.