"I fully agree that now JCPOA is a key pillar of non-proliferation regime. And if it fails actually it would be a failure for NPT, failure for non-proliferation regime," Araghchi said.
The diplomat told reporters that Tehran was ready for any developments around the nuclear deal following US President Donald Trump's statements.
The diplomat added that the commitments of Iran "not to go for nuclear weapons is permanent in the deal."
Araghchi also said that after the end of the limitations envisaged by the agreement, Iran would not start development of nuclear weapons, but would become "a normal member" of the Treaty on the Non-Proliferation of Nuclear Weapons (NPT).