Arms Control
There are a lot of debates about 'What North Korea wants.' First, what matters are the interests of the very top leadership, which is narrower than 'North Korea' or even 'the North Korean government.' Second, North Korea might use a range of strategies ..but we should remember that they're all aimed at the same underlying, fundamental objective: ensuring Kim's political survival.
The stakes are always higher in the first few years of a dictator's time in power, and the first few years are almost always more [internally] violent. The rules of the game under the new leader are still being established — both inside the country and externally — so it makes uncertainty higher.