By Francois MurphyVIENNA, May 29 (Reuters) - Iran and the United States are in discussions to extend their ceasefire so as to start negotiations on issues including Tehran's nuclear program, where Washington insists Iran must not be able to make a nuclear weapon.While much of Iran's uranium enrichment infrastructure was destroyed or badly damaged when Israel and the U.S. bombed it in June, a large part of the highly enriched uranium it amassed is thought to have survived. That is the biggest U.S. concern ahead of nuclear talks.

The US is reportedly pushing Iran to either hand over or remove its entire enriched uranium stockpile. | World News

Among the first issues to be negotiated during the 60-day window is what will happen to Iran’s highly enriched uranium, a US official said.