"The rule of ZANU-PF in Zimbabwe will continue until such time as it is overthrown by force."

Dead right. I suspect that such force will eventually be found within Zimbabwe itself...that usually happens at some point in a country with a government as insane as this one is. (Although, in the case of the Khymer Rouge it took a Vietnamese invasion to bring them down.)

In the meantime I think that the international community should apply exactly the kind of financial and diplomatic pressure Teribus has suggested. If no one was willing to do business with that government, it would soon fall.

Burma (Myanmar) comes to mind as well in that respect.