France, Britain and Germany have said they could reactivate United Nations sanctions on Iran under a "snapback" mechanism if Tehran does not return to the table. The European states, along with the U.S., say Iran is working towards developing nuclear weapons. Iran says it is only interested in developing nuclear power.

Iran’s supreme leader Sunday said the current issues between Washington and Tehran are “unsolvable’’ — warning his country will never bow to the US over their nuclear standoff. Ayatollah Ali Khamenei defended freezing the nations’ nuke talks after America’s involvement in Israel’s 12-day war in June against Iran’s atomic program,

The remarks by Supreme Leader Ayatollah Ali Khamenei comes as Tehran agrees to hold nuclear talks with European powers.