Despite the US and its allies blaming Pyongyang for increasing tensions, Washington cannot obscure the fact that it bears the main responsibility for declining diplomatic relations, especially as the Biden administration has switched back to a confrontational course following Donald Trump's efforts at de-escalation. Washington is fueling conflict to muscle closer ties with Japan and South Korea in order to expand its regional influence.
North Korea's escalating missile tests and repeated threats not to refrain from using tactical nuclear weapons demonstrate the regime's unpredictable hostility, putting the peace and stability of the entire region at risk. Kim Jong Un understands only the language of strength, as the failed negotiations in the Trump era have proven. US extended deterrence is the only way to both protect South Korea and force Kim to the negotiating table.
There's a 15% chance that North Korea and South Korea will be recognized as a single sovereign state by 2045, according to the Metaculus prediction community.