To be clear, there has been no formal offer and no formal rejection. What we've seen is media commentary made by Iran to attract attention to their position. While these negotiations are ongoing and we can't discuss details, I can assure you that there is strong coordination among all five countries that we will follow through on negotiations with a united voice to press Iran, and that negotiation will be beginning as soon as possible.
On May 13th, 2021. See this statement in context.