Amid Iran's threat of withdrawal, why Nuclear NPT is still important?

Iran recently exceeded the limits on uranium enrichment set out in its nuclear deal with the US and five other countries. Iran’s move was in response to the US‘s renunciation of the same deal last May.

Possession of the uranium doesn’t put Iran much closer to developing a nuclear weapon, but it does raise troubling questions about the future of nuclear nonproliferation.

Iran’s leadership has also twice threatened to withdraw from a separate pact that limits the spread of nuclear weapons, the Nuclear Non-Proliferation Treaty. If Iran does withdraw from the treaty, it