Before WWII the world was imperial. Nations that wanted something went out and took it. Between WWII and about 2014 the American hegemony prevented war on any large scale. This was a tactic to defeat the Soviets. But after the Soviet Union failed America began to lose interest in spending blood and treasure to keep the world safe for...not America, but America’s allies. The Allies never stepped up to the plate to defend themselves and now America is going home. So, all those empires are reemerging. But this time they will have nuclear weapons. What we are about to see is a worldwide race to acquire nuclear weapons as, if, Ukraine had them Russia would never have invaded, and everyone will see that.
My prediction for the next nuclear war will be between Turkey, Iran and Saudi Arabia. Then, possibly Pakistan and Iran, or India. Then, China and pick-your-target as EVERYONE hates China.
Those first three nations you mention were in a prophecy explanatory video I saw years ago that I don’t now remember the particulars of and can’t find but it played out like future history.
North Korea is a cult but acquiring nuclear weapons is a smart thing for them to do. No one is gonna #### with them.