Yang was accused of operating one of Africa's biggest ivory-smuggling rings, responsible for smuggling $2.5m (£1.9m) worth of tusks from some 400 elephants.
Yang, ayaa lagu eedeeyay inay ka shaqeyneysay mid ka mid ah shabakadaha Africa ugu weyn ee suuq geeya faanta maroodiga, waxaa la sheegay inay mas'uul ka yihiin ka ganacsiga faan maroodi oo qiima ahaan lagu qiyaasay 2.5m oo dollar, (£1.9m), oo laga soo gooyay 400 oo Maroodi ah.