State Departent Undersecretary For Political Affairs Wendy Sherman (R) and Treasury Undersecretary for Terrorism and Financial Intelligence David Cohen testify before the Senate Foreign Relations Committee about the ongoing P-5+1 talks with Iran during a hearing in the Dirksen Senate Office Building on Capitol Hill July 29, 2014 in Washington, D.C.

Lead U.S. negotiator declined to give a final deadline for final nuclear deal.

A screengrab taken on July 13, 2014 from a video released by the Nigerian Islamist extremist group Boko Haram and obtained by AFP shows the leader of the Nigerian Islamist extremist group Boko Haram, Abubakar Shekau.

At least three were killed in attack by militants on politician's home.

Venezuelan opposition leader Leopoldo Lopez (C) arrives at the Director of Public Prosecutions' office in Caracas on February 28, 2013 to be questioned about presumed irregularities concerning two donations made in 1985 by Petroleos de Venezuelas (PDVSA) state-owned oil company.

Leopoldo Lopez is accused of inciting violence during anti-government demonstrations.

Former Thai Prime Minister Yingluck Shinawatra spoke to the media on Friday for the first time since her government was ousted in a May coup, rejecting charges she was negligent in stemming corruption.

Yingluck Shinawatra on Friday spoke to the media for the first time since her government was ousted in May.

Ukrainian soldiers guard a checkpoint which was attacked earlier in the day by unknown forces on May 22, 2014 in Volnovakha, Ukraine.

Berlin warning that new European sanctions would send a "strong signal" to Moscow.

Soldiers with the Kurdish peshmerga walk at an outpost on the edges of the contested city of Kirkuk on July 3, 2014 in Kirkuk, Iraq.

Move will delay the formation of an urgently needed power-sharing government.

U.S. President Barack Obama speaks on the Ukraine situation outside the Oval Office of the White House July 21, 2014 in Washington, DC.

Obama voiced serious concerns about the growing number of civilian casualties resulting from conflict.