&lt;p&gt;UNICEF goodwill ambassador U.S. actress Mia Farrow speaks at the Olympic Dream for Darfur symbolic torch relay during a ceremony at the Holocaust Memorial in Berlin November 29, 2007. Failure to deploy a joint U.N.-African Union peacekeeping mission could push Sudan&#039;s Darfur region back into a spiral of violence, the military head of the mission said on Saturday. REUTERS/Hannibal Hanschke&lt;/p&gt;