North Korea Threatens More Tests

North Korea is upset that Japan isn't letting any North Korean ships into Japanese ports. In return, North Korea has issued a vague "strong warning" to Japan to stop. They're also threatening more nuclear tests if the UN puts more restrictions on them. In the meantime, South Korea is preparing for an attack by North Korea.

I've got two ideas on this.

1. North Korea is like a little kid. "If you don't do what I want I'm going to keep annoying you by testing nukes"

2. The first nuclear bomb test failed and they're looking for an excuse to test more in an effort to get it right.