Earlier quoted context omitted.
That's one of the lessons, isn't it? First the West reneged on the Nuclear deal with Iran, now Russia invaded Ukraine. All the while North Korea is just simply left alone.
Could you explain what you mean when you mention that "First the West reneged on the Nuclear deal with Iran"? I understand why the current situation would encourage Iran to pursue nuclear weaponry, but the agreement as far as I know did not include any defensive pact, so Iran didn't agree to forsake development of nuclear weaponry under the promise of protection from the west (which is now proving to be ineffective),…
Nope. The JCPOA agreement acknowledged (i.e. the US, the European signatories etc acknowledged) that Iran did _not_ have a nuclear weapons program. The JCPOA put in place stronger safeguards to ensure that remains the case.