The resolution aimed to extend sanctions relief under Security Council Resolution 2231 for six months to allow further diplomacy.
Russia, China, Algeria, and Pakistan voted in favor, while the United States, Britain, France, and five other members opposed it. Guyana and South Korea abstained.
Dorothy Shea, Acting US Representative to the UN advised Russia and China to ask Iran for full cooperation instead of postponing the sanctions.
“They must press leaders in Tehran to take meaningful immediate steps to fulfill its commitments and obligations, including by fully cooperating with the IAEA,” Shea said.
British ambassador to the UN Barbara Woodward told the Security Council the doors to diplomacy are not yet closed.
"The United Kingdom remains committed to pursuing a diplomatic solution that ensures Iran never acquires a nuclear weapon, while maintaining Iran's right to a civil nuclear program in line with the nuclear Non-Proliferation Treaty."
Russia's representative at the meeting said Moscow "had hoped that the US, that European colleagues in the US, would think twice and that they would opt for the path of diplomacy and dialog instead of their clumsy blackmail, which merely results in escalation of the situation in the region."
However, the envoy said, "what did we see instead, in the 29 days that have elapsed since then, was the very same typical scenario for Europeans of pressure."
Iran had already warned if the UN sanctions reinstated, it will halt cooperation with the International Atomic Energy Agency, (IAEA).
Iran's foreign minister Abbas Araghchi told the UN Security Council that "Iran put forward several constructive proposals in New York to avert an unnecessary and avoidable crisis, all were ignored."
"I have to remind the distinguished representative of France that two nights ago, I agreed with your foreign minister a framework agreement, but he was not able to get the agreement of the United States," Araghchi said.
Following the Security Council meeting, Araghchi told Iran International that the reimposition of UN sanctions could jeopardize Tehran's cooperation with the UN nuclear watchdog.
The snapback mechanism was triggered on August 28 by France, Germany, and the UK (E3), citing Iran's "significant non-performance,” including enriched uranium stockpiles exceeding JCPOA limits and restricted IAEA access to facilities like Natanz and Fordow.