Nuclear talks between Iran and the US have reached an impasse over Iran’s right to produce and stockpile low-enriched uranium. America first signalled that it was open to some enrichment before insisting that Iran must relinquish that right.

Iran is escalating its fight with the United Nations nuclear watchdog by accusing its inspectors of slander and presenting sloppy evidence, according to a legal brief compiled by the Islamic Republic and circulated among diplomats days before a key meeting in Vienna.

Iran rejected a U.S.-proposed nuclear deal Wednesday, vowing to continue enriching uranium while negotiations appear to be stalling after five

Iran opposes US demands to halt uranium enrichment, with Khamenei asserting Iran’s capability to produce nuclear fuel and its nuclear program as a matter of national pride.

Iran’s supreme leader, Ayatollah Ali Khamenei, said on Wednesday that abandoning uranium enrichment was “100 percent” against Tehran’s interests, effectively rejecting a key U.S. demand in weeks of tense negotiations over Iran’s nuclear program.

WASHINGTON (AP) — President Donald Trump on Monday appeared to undercut a proposal that was offered by his special envoy to Iran, saying he will insist that Tehran fully dismantle its nuclear enrichment program as part of any deal to ease crushing sanctions.

Iran has dramatically increased its stockpile of uranium needed to create nuclear weapons and has fallen short of compliance with international regulators, according to an IAEA report.