"We will not be coordinating with Iran" on military action, "but as I said, we are open to have a conversation," Kerry told reporters in Paris after an international conference on Iraq.
"On Syria strikes, we are not going to coordinate with the Syrians, we have made that very, very clear, but there are all kinds of ways of communicating to avoid mistakes or disaster," he added.
US President Barack Obama has outlined a strategy to combat the Islamic State extremists, including air strikes in Syria and expanded operations in Iraq, where US aircraft have carried out more than 160 strikes since early August.
State Department spokeswoman Jen Psaki had told reporters earlier that there "may be another opportunity on the margins in the future to discuss Iraq" with the Tehran authorities.
Iran was not invited to the Paris conference and later said it had no wish to attend the gathering that it said was purely "for show".
Iran's supreme leader Ali Khamenei then revealed he had rejected a US request for cooperation in the fight against the militants because the Americans had "dirty hands".
Western diplomats have voiced concern privately that Iran wants to link its cooperation in the fight against jihadists to negotiations over its disputed nuclear programme.
On the nuclear talks, Kerry said: "I am hopeful it will possible to find a way to reach an agreement that is important to the world. But there are very difficult issues" still to be resolved.
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
