LAUSANNE, March 28. /TASS/. Iran keeps hoping for an agreement with the six international negotiators on its nuclear program, but the sides still have some differences, including on technical issues, the head of the Atomic Energy Organization of Iran (AEOI), Ali Akbar Salehi said Saturday.

"We are still optimistic regarding the possibility of an agreement, but far from all technical issues have been resolved," Salehi told journalists.