Earlier in the day, the UK official participated in an online meeting of the foreign ministries from the JCPOA signatory-countries, which included China, France, Germany, Russia and Iran, as well as the European Union.
In December, Iran passed a bill to increase its Uranium enrichment and stop UN inspection of its nuclear sites in response to the killing of nuclear physicist Mohsen Fakhrizadeh.
In 2015, Iran signed the JCPOA with China, France, Germany, Russia, the United Kingdom, the United States, Germany and the EU. It required Iran to scale back its nuclear program and severely downgrade its uranium reserves in exchange for sanctions relief, including lifting the arms embargo five years after the deal's adoption. In 2018, the US abandoned its conciliatory stance on Iran, withdrawing from the JCPOA and implementing hard-line policies against Tehran.