Iran’s parliament has threatened to push for a withdrawal from the nuclear Non-Proliferation Treaty if the West continues to ratchet up pressure over its atomic programme.
The statement comes a day before key UN members discuss a legally-binding draft resolution.
Pulling out of the NPT would mean Tehran would no longer be obliged to comply with inspections of its nuclear sites.
Foreign ministers from the five permanent members of the Security Council and Germany meet in New York on Monday.
On the table is a draft resolution, backed by the US and introduced by Britain and France, which seeks to invoke Chapter 7. This makes it binding under international law and could lead to sanctions or even military action.
However, the Russians and Chinese are not yet convinced.
Iran says it is within its international rights to seek nuclear power and that it is not trying to build a weapon.