AXIOS (Barak Ravid) - U.S. asked Iran to freeze uranium enrichment for 20 years, sources say
The U.S. proposed that Iran accept a 20-year moratorium on uranium enrichment during negotiations in Islamabad over the weekend, according the a U.S. official and a source with knowledge. - The Iranians countered with a shorter "single digit" period, according to the sources. Why it matters: The differences over Iran's nuclear program — and in particular, whether Tehran will agree not to enrich uranium and to give up its existing stockpile — were the main sticking point that prevented a deal, the sources say. Driving the news: Pakistani, Egyptian and Turkish mediators are now trying to bridge the remaining gaps and reach a deal to end the war before the ceasefire ends on April 21. - Meanwhile, President Trump announced a blockade…