DUBAI, United Arab Emirates — Iran's theocracy prepared Sunday for a possible confrontation with the West after the United Nations reimposed sanctions over its nuclear program, even as some pushed for continued negotiations to ease the economic pain squeezing the country. The sanctions imposed before dawn Sunday again freeze Iranian assets abroad, halt arms deals with Tehran and penalize any development of Iran’s ballistic missile program, among other measures. It came via a mechanism known as “snapback,” included in Iran’s 2015 nuclear deal with world powers. Iran has long insisted its nuclear program is peaceful, though the West and IAEA say Tehran had an organized weapons program up until 2003. Iranian Foreign Minister Abbas Araghchi, speaking to Iranian state TV before the sanctions were imposed, sought to downplay the effect U.N. sanctions would have on the country.