The warning from Iran’s deputy foreign minister came days before he is set to travel to Istanbul for nuclear talks with European counterparts.

A top Iranian official warned Wednesday that European threats to reimpose sanctions could lead Iran to withdraw from an international pact that limits the spread of nuclear weapons, one of the last remaining safeguards against the Islamic Republic's nuclear program.

If the snapback is triggered, Iran will not show more restraint in this regard,' Iran's lead nuclear negotiator told reporters.