Russian President Vladimir Putin says there is a "real chance" to resolve the decade-long standoff over Iran's nuclear program.
The Kremlin said Monday Mr. Putin delivered the statement in a telephone conversation with Iranian President Hassan Rouhani, who welcomed Russia's efforts in the negotiations.
Russia is one of six nations, including the United States, set to take part in another round of talks with Iran in Geneva Wednesday, as they seek to address concerns that Iran is pursuing nuclear weapons.
Following the phone call, Iran's president tweeted that during the previous round of talks in Geneva, the sides were quite close to an agreement but that "due to the complication that arose - and you're aware of - agreement had to be postponed."
Mr. Rouhani also tweeted that all of Iran's nuclear activities "are peaceful" and under the supervision of the United Nations' nuclear agency .
The six world powers that also include Britain, France, China and Germany want Iran to curb its enrichment activity, while Iran is seeking relief from sanctions that have hurt its economy.
Separately Monday, Iran unveiled its newest drone aircraft. Officials say the 'Fortros' has a range of 2,000 kilometers and can stay airborne for up to 30 hours.
Iran's defense minister said the drone would be used for reconnaissance and patrolling missions.