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.

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 three European countries, or E3, are parties to the original nuclear agreement, formally called the Joint Comprehensive Plan of Action.