A 100 Yuan note is seen in this illustration picture in Beijing March 7, 2011. REUTERS/David Gray/File Photo

Leon Cooperman, chairman and CEO of Omega Advisors, speaks during the Sohn Investment Conference in New York May 4, 2015. REUTERS/Brendan McDermid

An IranAir Boeing 747SP aircraft is pictured before leaving Tehran's Mehrabad airport. REUTERS/Morteza Nikoubazl

A damaged UNHCR truck is pictured after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city. REUTERS/Ammar Abdullah

A man reacts while being carried on a stretcher after airstrikes on the rebel held al-Qaterji neighbourhood of Aleppo. REUTERS/Abdalrhman Ismail

A boy rides a bicycle near a damaged aid truck after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city. REUTERS/Ammar Abdullah

Damaged aid trucks are pictured after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city. REUTERS/Ammar Abdullah

A boy inspects a damaged aid truck after an airstrike on the rebel held Urm al-Kubra town, western Aleppo city. REUTERS/Ammar Abdullah