U.S. special envoy on global efforts to aid millions displaced by Sudan's civil war

U.N.-backed human rights investigators accuse both sides in the Sudanese civil war of war crimes.

More than 10 million are displaced, millions are hungry and tens of thousands have been killed.

U.S.-backed peace talks in Geneva failed to end the fighting in Darfur .

Tom Perriello : "We were able to have a great deal of success opening up several of the humanitarian supply routes".

U.N. backed human rights investigators called for a "independent impartial force" to protect civilians.

That could include boots on the ground.

U.S. has increased sanctions on both SAF and RSF leaders. We will continue to have that be a central part of this strategy as we look to raise the costs of those that are imposing the suffering on the Sudanese people..

Dan Schifrin was one of the first journalists to arrive in Abbottabad , Pakistan , after Osama bin Laden’s death in 2011 .

His reporting helped ABC News win an Edward R. Murrow award for its bin Laden coverage.

He has a Bachelor 's degree from Columbia University and Master of International Public Policy degree from Johns Hopkins School of Advanced International Studies .