The claim is strongly supported by the Reuters report '米、ウラン濃縮20年停止を提案 イランとの協議で=報道' at both https://jp.reuters.com/markets/commodities/YER453CIXRJSJDBWUKENUZA33Q-2026-04-13/ and http://reut.rs/4vsEOFQ. Reuters specifically states that Axios reported the United States proposed a 20-year pause in uranium enrichment, that Iran offered a shorter 'single-digit years' period, and that the U.S. asked Iran to remove all highly enriched uranium from the country. A corroboration search also surfaced the Axios article 'U.S. asked Iran to freeze uranium enrichment for 20 years, sources say,' which aligns with the Reuters summary. Direct fetching of Axios failed, so the strongest validated evidence in this run is Reuters' summary of Axios.