As the diplomatic push to renew ceasefire talks between the United States and Iran continues, Washington and Tehran have also been negotiating a deal on Iran’s uranium enrichment.Iran’s current stockpile of enriched uranium — and its ability to enrich further — have been central elements of the long-standing demand by the administration of US President Donald Trump that Tehran not only commit to not building a nuclear weapon, but also give up the ability to do so.Recommended Stories list of 3 itemsend of listNow, according to multiple US media reports, specific differences regarding Iran’s nuclear enrichment have emerged as a critical stumbling block in negotiations between the two countries aimed at ending their war.High-powered teams from the US and Iran met in Islamabad, Pakistan, over the weekend, but failed to agree to a deal. Pakistan is attempting to get both sides to come to a second round of talks.The breakdown in talks in Pakistan over the weekend occurred over a US insistence that Iran suspend its uranium enrichment programme for 20 years in exchange for sanctions relief, followed by Tehran’s refusal to agree to a moratorium on enrichment beyond five years.So why are Iran and the US arguing over the duration of uranium enrichment? Will it impact ceasefire talks?Here’s what we know:What does uranium enrichment mean?Uranium is a naturally occurring radioactive material found in rocks, soil, and water, which, when enriched, is used as a source of fuel for nuclear reactors.It comes …