In-person talks between the US and Iran could resume as early as this week, according to NBC News

The US asked Iran during the marathon talks over the weekend for a 20-year suspension of uranium enrichment.  The Iranians agreed to 2-5 years, which President Donald Trump has said is not acceptable, the source said. US has asked Iran to remove highly enriched uranium from the country, but Iran agreed to a "monitored process of down blending" — a process where highly enriched uranium is mixed with natural or less potent uranium to create a less potent material.