Greenpeace's exhortations to North Korea asking it to renounce its nuclear weapons are laughably naive:

[North Korea] should immediately set aside their weapons and rejoin the Nuclear Non Proliferation Treaty (NPT) regime. They should advocate for the disarmament of the US and other nuclear weapons states from within the treaty system, not from without.

In short, North Korea should simply bend over and invite the US to have a go at them...