North Korea already decided to close Kaesong Industrial Complex on 30th March according to the blog Northkoreanleadershipwatch. So this closing isn't at all an aggressive provocation or a freaking unannounced move.
Seriously, Pyongyang is back to the wall and in a defensive position.
The 12th Supreme People’s Assembly [SPA] decided today that :
The DPRK is a full-fledged nuclear weapons state capable of beating back any aggressor troops at one strike, firmly defending the socialist system and providing a sure guarantee for the happy life of the people.
Having an independent and just nuclear force, the DPRK put an end to the distress-torn history in which it was subject to outside forces’ aggression and interference and could emerge a socialist power of Juche which no one dares provoke.
The Supreme People’s Assembly of the DPRK decides to consolidate the position of the nuclear weapons state as follows:
The nuclear weapons of the DPRK are just means for defence as it was compelled to have access to them to cope with the ever-escalating hostile policy of the U.S. and nuclear threat.
They serve the purpose of deterring and repelling the aggression and attack of the enemy against the DPRK and dealing deadly retaliatory blows at the strongholds of aggression until the world is denuclearized.
The DPRK shall take practical steps to bolster up the nuclear deterrence and nuclear retaliatory strike power both in quality and quantity to cope with the gravity of the escalating danger of the hostile forces’ aggression and attack.
The nuclear weapons of the DPRK can be used only by a final order of the Supreme Commander of the Korean People’s Army to repel invasion or attack from a hostile nuclear weapons state and make retaliatory strikes.
The DPRK shall neither use nukes against the non-nuclear states nor threaten them with those weapons unless they join a hostile nuclear weapons state in its invasion and attack on the DPRK.
The DPRK shall strictly observe the rules on safekeeping and management of nukes and ensuring the stability of nuclear tests.
The DPRK shall establish a mechanism and order for their safekeeping and management so that nukes and their technology, weapon-grade nuclear substance may not leak out illegally.
The DPRK shall cooperate in the international efforts for nuclear non-proliferation and safe management of nuclear substance on the principle of mutual respect and equality, depending on the improvement of relations with hostile nuclear weapons states.
The DPRK shall strive hard to defuse the danger of a nuclear war and finally build a world without nukes and fully support the international efforts for nuclear disarmament against nuclear arms race.
The related institutions shall take thorough practical steps for implementing this ordinance.
Alright there are only words, but they are words that go in a peaceful direction. They decided to speak about nukes openly and publicly. I won't talk about indirect peacetalk, but almost.
North Korea doesn't know how to communicate and USA doesn't know how to understand North Korea. At this very moment, USA is posturing aggressively (moving two THAAD batteries, nuclear submarines and destroyers near Guam) and didn't hesitate to push its military exercises with South Korea in a tense situation (even Bush Jr. chose to cancel them in the past).
North Korea tries to calm down the situation and begs for peace. I don't know who is recklessly and stupidely provoking who ...