<span style="color: #222222;">The head of the UN nuclear watchdog will visit Tehran on Monday to discuss Iran's nuclear programme, the spokesman for Iran's atomic agency said, as several key dates approach.<br />'' <br />'' International Atomic Energy Agency (IAEA) chief Rafael Grossi had expressed concern on November 12 over the lack of contact with the Iranian government, describing it as astonishing.<br />'' <br />'' He said, he had hoped to meet Iranian officials ahead of the next meeting of the IAEA's Board of Governors, which was scheduled for November 22.<br />'' <br />'' Iran responded three days later by inviting the UN nuclear chief to Tehran.<br />'' <br />'' The spokesman added that Grossi will meet Foreign Minister Hossein Amir-Abdollahian and the head of Iran's atomic agency, Mohamed Eslami.<br />'' <br />'' Grossi's last visit to Tehran was in September when he said he had technical discussions with Eslami.<br />'' <br />'' Grossi's visit comes ahead of the resumption of nuclear talks on November 29 in Vienna, stalled since June. The talks aim to restore a 2015 deal that offered Tehran relief from sanctions in exchange for major curbs on its nuclear activities.<br />'' <br />'' The Vienna talks will be attended by the remaining parties to the deal — Britain, China, France, Germany, and Russia — while the US will participate in negotiations indirectly.<br />'' <br />''<br />''The US unilaterally pulled out of the deal in 2018 under the administration of President Donald Trump but talks to revive it began earlier this year.</span><br />