> So you're saying if a region declares independence and gets foreign allies to provide effective military protection for X weeks/years, then the original country has lost any right to that land?
This is how the United States claims to exist, by the way.
I think the major difference is that on September 3, 1783 Great Britain itself recognized the independence of the United States. I'm not sure that any of Crimea, Kosovo, or Taiwan share that recognition of their independence from who they are claiming to be independent from (the ROC, in fact, doesn't even claim to be independent, they claim that the PRC itself holds no claim over mainland China and that it is rightfully the territory of the ROC).
This is how the United States claims to exist, by the way.