There are plenty more examples in the breakup of the Soviet Union. Most of the Republics never had an independent existance prior to the breakup and the borders were drawn either by the Czarist administration or by the Soviets (e.g., Stalin redrew the borders of Ukraine at one point). So, when the USSR breaks up the internal borders are preserved and you get Nagorno-Karabakh between Armenia and Azaerbaijan, Transdnistria seceding from Moldova, the Crimea question between Russia and Ukraine, Abkhazia and Ossetia (North and South) between Georgia and Russia, Chechnya...

We have met the enemy, and he is us — Pogo