Well if we are talking about non signatories to the treaty then there is also Pakistan and North Korea.
Both countries the West will also topple and / or prop when the time is right. NK is a stain on the US's record having only reached a stalemate in their war, rather than an outright win. They are the quintensential "Iranian Revolution", just over 50 years prior and of a by gone Communist era. None the less an embarrassing thorn in their side.
Pakistan is a consequence of India, in terms of Nuclear armament. Sanctions and strong politics didn't work against India, and Pakistan was left in the position of an arms race. But in this case India has been embraced by the US, despite India's pursuit of Nuclear weapons and a stockpile 10 times that of Pakistan (roughly 100 warheads as of 1974 statistics). But the situation today is that the US is using India as a bulwark against China and also the Muslim world. India is the "defacto Anglo" of the region and will serve as great human fodder against a Chinese land army.
NK is well under control but also serves as an excuse to meddle in Eastern affairs. NK constantly puts fear into 2 US allies (Japan and S Korea) and will make for a great excuse to send warships into the region under a false pretext. Taiwan and the Philipine (dispute over S Chine Sea territory) is simply too imflamatory and not a clear cut case for "intervention", such as NK presents.
So for the most part Pakistan is a consequence of India, but the US will get to them later, and NK is actually a benefit to the US for later sabre rattling.
PS you know who leaked the Manhattan project's nuclear secrets to Israel in the first place? Eduard Teller aka "The Father of the H-Bomb" and head of the Manhattan Project...look into where his alliegences lay!
Oh and who leaked the Manhattan Project's secrets to the Soviets? Theodore Hall and Klause Fuchs; both (both scientists working on the Manhattan Project).
http://www.smithsonianmag.com/history-archaeology/Spies-Who-Spilled-Atomic-Bomb-Secrets.html
Israel's involvment in the building and dessemination of Nuclear weapons makes them the most prolific proliferator of WMDs the world has known, both building and developing them as well as spreading them globally. It is no surprise the current situation is the way it is today. Israel is BAR NONE the largest threat to world peace today and has been a considerable menace since 1918 (and the Belfour Decleration) and prior in the form of the Zionist movement (though well behind the US, Germany and the Soviets until now). Israel has constantly threatened that if even conventionally attacked, they will Nuke the region...while they go on attacking Palestinians and taking more land and creating an apparteid state...hmmmmm, yeah Iran is the threat?
Iran on the other hand was controlled by a British / Russian then turned American puppet monarchy and in 1953 when the Iranians had a DEMOCRATIC change in government, the US (CIA) over threw it and re-installed the dictatorship of the Shah! It seems the US wasn't too happy to have an "Iranian Spring" back then! So...28 years later the pendullum swings (predictably) to a more extreme revolution (BTW, also a democratic one, but this time extremely hostile to the US) and this time to pre-empt a CIA coup, the revolution of 1979 took the entire US embassy (which was a US spy ring anyways) hostage. This hostage crises prevented the US from covertly or overtly invading after the 1979 revolution the way it had in 1953!
http://en.wikipedia.org/wiki/1953_Iranian_coup_d'état
So once again, whooooooooooo is the threat in the region / world? Who is ratcheting up the rhetoric for war right now?
Oh forgot to mention, also in 1979, due to the US's inability to invade Iran, they sponsored the new dictator who assumed power through a military coup next door....That's right, our old buddy Saddam! And the US sponsored an 8 year war with Iran!!!!!
Iran hasn't initiated a war in the region or ANYWHERE in over 150 years! Oh and those last wars, they were with Ottoman Turks and largely border territory skirmishes. It would be worth researching why they were invaded and occupied in WW1 also, when they had NOTHING to do with the war or even the Ottomans! Why then was Iran (then the Qajar Empire was pre-decided by the British and Russians to be shared "spheres of influence"....you guessed it...for OIL!!!) They are also (if they are even pursuing nuclear weapons) behind the US, Israel, Russia, China, North Korea, Britain, France, India, Pakistan, South Africa (attained under the appartheid state but since self-decomissioned).
Yeah Iran is a real threat, yup sure, time to pull the embassy, yep, bomb them back to the "stone age", yep, not us, we're no threat - they are.
They suffered the Holocaust 
