Mediators from Qatar, Turkiye and Egypt have presented Iran and the United States with a framework of key principles to be discussed in talks on Friday this week, including a commitment by Iran to significantly limit its uranium enrichment, two sources familiar with the negotiations have told Al Jazeera.Key points in the proposed framework also include restrictions on the use of ballistic missiles and the arming of Iran’s allies in the region, according to the sources, who include a senior diplomat who asked to remain anonymous due to the sensitive nature of the talks.Recommended Stories list of 3 itemsend of listAn Iranian source has separately told Al Jazeera that the talks, which US special envoy Steve Witkoff and Iranian Foreign Minister Abbas Araghchi are expected to attend, will take place in Oman and not Turkiye as previously planned.This slim window for diplomacy comes as the region braces for a potential US attack on Iran after President Donald Trump ordered forces to amass in the Arabian Sea following a violent crackdown by Iran on protesters last month.What is in the proposals?Under the proposed framework for an agreement, Iran would commit to zero enrichment of uranium for three years. After that, it would agree to limit enrichment of uranium to below 1.5 percent.Its current stock of highly enriched uranium – including about 440kg (970lb) that has been enriched to 60 percent – would be transferred to a third country.The proposed framework goes beyond Iran’s nuclear programm …