UN imposes snapback sanctions on Iran over its nuclear program

The measures, which bar dealings linked to the Islamic republic's nuclear and ballistic missile activities, took effect overnight after Western powers triggered the so-called "snapback" mechanism under the 2015 nuclear accord.

"The reactivation of annulled resolutions is legally baseless and unjustifiable... all countries must refrain from recognising this illegal situation," the Iranian foreign ministry said in a statement.

"The Islamic Republic of Iran will firmly defend its national rights and interests, and any action aimed at undermining the rights and interests of its people will face a firm and appropriate response," it added.