Is North Korea a threat or a nuisance to us right now?

Right now they are a nuisance, but that does not mean we should ignore them. They could become a threat if we don't keep our military presence close to them in South Korea and Japan and don't put missile defense shields in the region to shoot down their missiles.

They are a threat. Their missiles could hit Alaska. If they continue they could get a nuke that can hit California.

Iran does not sponsor terrorism. They are Shia and the terrorists are Sunni like ISIS or al Quaeda supported by Saudi Arabia and the U.S. Even South Korea is not afraid of an attack from the north.

Kim Jong Un is not a lunatic. He is being provoked by the U.S. and the south, what else can he do? He would like end to sanctions, no more war maneuvers, and the ability to purchase goods. Iran may have provided DPRK with technology.

"Iran is to receive a huge shipment of natural uranium from Russia to compensate it for exporting tons of reactor coolant, diplomats say, in a move approved by the outgoing U.S. administration and other governments seeking to keep Tehran committed to a landmark nuclear pact."