Iran will respond to the European Union's "final" text by midnight on Monday, Iranian Foreign Minister Hossein Amirabdollahian said, calling on the United States to show flexibility for the revival of a 2015 nuclear pact.

"We will need more talks if Washington does not show flexibility for resolving of the remaining issues ... Like Washington, we have our own plan B if the talks fail," he said, according to Iran's Fars news agency.