Rump state

Reduced territory of a once-larger state

A rump state is the remnant of a once much larger state, that was reduced in the wake of secession, annexation, occupation, decolonization, a successful coup d'état or revolution on part of its former territory. In the last case, a government stops short of going into exile because it controls parts of its remaining territories.

This keyword could refer to multiple things. Here are some suggestions: