The United Nations Security Council overwhelmingly rejected a US resolution to extend an Iranian arms embargo on Friday, in a move with huge repercussions for the Iran nuclear deal.
Only two of the Council's 15 members voted in favour, highlighting the division between Washington and its European allies since President Donald Trump withdrew from the nuclear accord in May 2018.
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Tehran mocked the Trump administration for its failure to win more than just a single vote of support, from the Dominican Republic.
Washington's European allies all abstained.
US President Donald Trump gestures at a meeting. File photo
"In the 75 years of United Nations history, America has never been so isolated," foreign ministry spokesman Abbas Mousavi tweeted.
"Despite all the trips, pressure and the hawking, the United States could only mobilize a small country (to vote) with them."
The result increases the likelihood that the US will try to unilaterally force a return of UN sanctions, which experts say threatens to plunge the Council into one of its worst-ever diplomatic crises.
'Inexcusable'
"The Security Council's failure to act decisively in defense of international peace and security is inexcusable," US Secretary of State Mike Pompeo said in a statement.
The embargo on conventional arms is due to expire on October 18 under the terms of a resolution that blessed the Iran nuclear deal, signed in July 2015 and officially known as the Joint Comprehensive Plan of Action (JCPOA).
US Secretary of State Mike Pompeo listens a question at a press conference. File photo
Under the deal, negotiated by then US president Barack Obama, Iran committed to curtailing its nuclear activities for sanctions relief and other benefits.
Since Trump pulled out and slapped unilateral sanctions on Iran under a campaign of "maximum pressure," Tehran has since taken small but escalating steps away from compliance with the nuclear accord as it presses for sanctions relief.
European allies of the United States — who, along with Russia and China, signed the deal with Iran — have voiced support for extending the 13-year-long conventional arms embargo, saying an expiry threatens stability in the Middle East.
However, their priority is to preserve the JCPOA.
The US text, seen by AFP, effectively called for an indefinite extension of the embargo on Iran, which diplomats said would threaten the nuclear agreement.
Iran says it has the right to self-defense and that a continuation of the ban would mean an end to the nuclear deal.
Pompeo announced that members had failed to back the proposal around 30 minutes before Indonesia, the current president of the Security Council, announced that the official results included two votes against and 11 abstentions.
Russia and China opposed the resolution.
"The result shows again that unilateralism enjoys no support, and bullying will fail," China's UN mission tweeted.
Agence France-Presse