Pakistan, June 2 -- Iran is preparing to dismiss the latest US offer aimed at resolving the long-standing nuclear dispute, describing it as a "non-starter" that ignores Tehran's key demands and keeps the US firm on uranium enrichment restrictions.

A senior Iranian diplomat close to the negotiation team told Reuters that Iran is drafting a negative response, which is expected to amount to a formal rejection of the proposal presented last Saturday by Oman's Foreign Minister, who has been mediating between Tehran and Washington.

The US proposal, following multiple rounds of talks between Iranian Foreign Minister Abbas Araqchi and the US Middle East envoy Steve Witkoff, fails to address critical issues, particularly Iran's insistence on mai...