A former U.S. State Department official who had been tasked with overseeing sanctions on Iran is urging Japan to refrain from engaging in economic activities there for now in line with steps aimed at curbing Tehran's nuclear activities.

"I think for this six-month period, it will be important for the international community to hold back especially in the sanctioned areas and wait to see if things work out," Robert Einhorn said Tuesday during a visit to Tokyo.

His remarks came after Iran and six countries — Britain, China, France, Germany, Russia and the United States — reached a first-stage agreement in Geneva last month in which Iran is to curb its nuclear activities in return for having some sanctions eased.