Iran said a longstanding UN embargo on arms sales to and from the Islamic republic expired yesterday in line with a 2015 landmark nuclear deal with world powers from which Washington has withdrawn. 

Tehran, which could now purchase weapons from Russia, China and elsewhere, has hailed the development as a diplomatic victory over its arch enemy the US, which had tried to maintain an indefinite freeze on arms sales.

"As of today, all restrictions on the transfer of arms, related activities and financial services to and from the Islamic Republic of Iran... are all automatically terminated," the foreign ministry said in a statement.

The embargo on the sale of conventional arms to Iran was due to start expiring progressively from yesterday, October 18, under the terms of the UN resolution that blessed the 2015 nuclear deal between the Islamic republic and world powers.

"As of today, the Islamic Republic may procure any necessary arms and equipment from any source without any legal restrictions, and solely based on its defensive needs," the ministry added in the statement sent out on Twitter. It insisted that under the terms of the deal, struck with the United States, China, Britain, France, Germany and Russia, "the lifting of arms restrictions and the travel ban were designed to be automatic with no other action required."

Washington suffered a setback in August when it failed to win support from the UN Security Council to indefinitely extend the arms embargo.

It was "a momentous day for the international community," the Iranian ministry said yesterday, adding the world had stood with Tehran "in defiance of the US regime's efforts". But it stressed that "unconventional arms, weapons of mass destruction and a buying spree of conventional arms have no place in Iran's defense doctrine".