Iran is willing to return to the negotiating table with the U.S., "the sooner the better," but must be convinced the talks aren't cover for further military action, Tehran's nuclear negotiator Kazem Gharibabadi said on Wednesday.

The warning from Iran comes as the Trump administration is once again seeking to reach a deal with Tehran on its nuclear program.

Iran, Britain, France and Germany will hold nuclear talks in Istanbul on Friday, an Iranian Foreign Ministry spokesperson said early on Monday, following warnings by the three European countries that failure to resume negotiations would lead to international sanctions being reimposed on Iran.

The talks will be the first since a ceasefire was reached after a 12-day war waged by Israel against Iran in June.

Diplomatic delegations from Iran, Russia and China held a trilateral meeting in Tehran to discuss developments in nuclear negotiations, the lifting of sanctions on Iran, and

Germany, France and the United Kingdom are coordinating plans to hold nuclear talks with Iran in the coming week, a German diplomatic source told Newsweek.

Iranian representatives will meet with negotiators from Britain, France and Germany on Friday, days after they threatened to restore economic restrictions.