Russian Foreign Minister Sergei Lavrov, who joined the talks in Vienna earlier today, said however he believes that, after almost two years of trying, a deal ending the 13-year standoff is "within reach".
The talks are "progressing in a positive direction. There remain questions, mostly regarding procedural issues rather than technical," Lavrov told Russian television after meeting US Secretary of State John Kerry.
"We have all reason to believe that results are within reach," Lavrov said.
But after Kerry met with Zarif for almost two hours after his return, the US State Department said the P5+1 group of global powers had agreed to extend the terms of an interim agreement until July 7.
A State Department official said however that this did "not necessarily mean they will go until the 7th or end on the 7th."
Kerry had also made no plans for when he might leave the Austrian capital.
After one-on-one talks, the top American diplomat and Zarif were joined by their teams for a broader meeting, including with nuclear experts US Energy Secretary Ernest Moniz and Iran's nuclear chief Ali Akbar Salehi.
The two Massachusetts Institute of Technology alumni played a key role in brokering the outlines of a breakthrough accord in April in Lausanne, Switzerland.
Supreme leader Ayatollah Ali Khamenei appeared to give Zarif his blessing, tweeting in English Tuesday: "I recognise our negotiators as trustworthy, committed, brave and faithful.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
