United States has decided not to reimpose sanctions on Iran's nuclear program despite President Donald Trump's criticism of the deal Tehran signed with the previous US administration. <br/><br/>However, while the waiver on the nuclear-related sanctions was renewed, the US Treasury imposed new measures to punish Iranian defense officials and a Chinese business tied to Tehran's missile program. <br/><br/>The decision not to renew sanctions came just two days before Iran is due to go to the polls and may prove a boost for President Hassan Rouhani, who signed the deal and is seeking re-election.<br/><br/>Under the terms of the 2015 deal, the previous US administration of President Barack Obama agreed to waive<br/>sanctions on Iran's nuclear program in return for strict controls to prevent its developing a bomb.<br/><br/>In return, Iran pledged to restrict its nuclear activities, reducing its uranium enrichment, plutonium production plans, and allowing inspectors access to facilities