You can’t blame Kim Jong-un for flexing North Korea’s military muscle when Biden is recklessly saber-rattling with Taiwan and China — how does he know the US won't also team up with South Korea for an invasion of the North? Trump's relationship with, and policies towards North Korea maintained stability in the Korean Peninsula.
Kim Jong-Un's geopolitical actions have been erratic, and his missile launches are destabilizing the Peninsula. Instead of provoking a confrontation, the leader should take the Biden administration up on its offer to meet without preconditions, and settle any grievances peacefully. Biden is showing strength and prudence in the region.
There is a 36% chance that, if there's an offensive detonation anywhere by 2050, there will be at least one resulting fatality in North Korea, according to the Metaculus prediction community.