I am looking for examples of both successful and unsuccessful national secession attempts in the 21st century in order to determine in which contexts the international community has supported or opposed such attempts.
In general, under what conditions have the international community been supportive of secession attempts in recent decades? Under what conditions have they been opposed? When faced with a situation of national schism, does the international community generally prefer secession of part of the country or overthrow of the entire government? On what factors have either option been preferred?