File photo shows US Undersecretary of State Burns gesturing during a discussion in Berlin
U.S. Undersecretary of State Nicholas Burns gestures during a discussion in Berlin in this September 8, 2006 file photo. Europe, Russia and China should follow the U.S. lead and take other measures beyond recently enacted U.N. sanctions to pressure Iran to abandon its nuclear program, including curbing arms sales and trade credits, Burns said on January 13, 2007. REUTERS/Arnd Wiegmann/Files (GERMANY)