Ditto.
The key is to get the scumbag death rate high enough that they run out of fighters.
This is by no means impossible, we did it to both Japan and Germany from 1941-45.
Well, yes and no. The Kamikazes were still signing up in large numbers.
The solution, then, was to obliterate a couple of population centers.
I guess we haven't gotten to that point. Yet.