North Korea has nuclear weapons, has conducted nuclear tests, has threatened to use the weapons, and has attacked it neighbor. Iran does not have nuclear weapons, has not threatened to use the non-existent (wiping Israel off the map is political), and has not attacked its neighbors. Yet Iran is the one to worry about. Maybe for Israel, but not for the rest of the world.
Donald Trump: Israeli settlement construction in West Bank should 'keep going' (Haaretz)
from the article: As North Korea blusters, the Iranian nuclear clock ticks away