Iran’s chief negotiator has said the draft proposals his country submitted during talks with world powers aimed at reviving a 2015 nuclear deal “cannot be rejected”.

Representatives of Iran, China, France, Germany, Russia and the United Kingdom convened this week in Vienna for the seventh round of talks to restore the landmark accord, formally known as the Joint Comprehensive Plan of Action (JCPOA).

The United States, which unilaterally withdrew from the pact in 2018 when it also reimposed punishing sanctions against Iran, is only participating indirectly as Iran refuses to hold direct negotiations with it.