Speaking on the eve of a deadline to present a deal to the US Congress, Kerry told reporters that because "the stakes are very, very high, we will not rush and we will not be rushed."
"We're here because we believe we're making real progress toward a comprehensive deal. But as I have said many times, and as I discussed with President (Barack) Obama last night, we are not going to sit at the negotiating table forever," Kerry said.
French Foreign Minister Laurent Fabius, announcing he would stay in the Austrian capital Thursday night to continue the talks, said meanwhile that problems remain.
"Things are however going in the right directions. Under the circumstances I have decided to stay tonight and tomorrow," Fabius told reporters.
"I hope that we are going to manage the final metres (yards), but there is still work to do. In a marathon the final 100 metres are the hardest," Fabius said.
The mooted deal between Iran and the P5+1 group -- Britain, China, France, Germany, Russia and the United States -- is aimed at ending a 13-year standoff by curbing Iran's nuclear activities in exchange for sanctions relief.
But an Iranian official insisted to AFP: "For us, no date is sacred if it means sacrificing a good accord."
And Iranian Foreign Minister Mohammad Javad Zarif said on Twitter shortly after Kerry's statement: "We're working hard, but not rushed, to get the job done."
Later he shouted to reporters from the balcony of the Coburg hotel where the talks were being held: "We will stay as long as necessary."
Diplomats from various delegations ruled out a deal by the end of Thursday, but when asked whether an accord would be possible Friday or Saturday, one Iranian official told AFP: "God only knows.
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
