Xentherida:
Yes, you would've had to deal with a lot of military refugees, but not so many civilians... If civilians managed to get past, it would be thousands at a time, although these breakthroughs were rare. Most of them successfully managed to flee to either Ceretis, Tomb or Plembobria, some of them became integrated in the nearby tribes, although a few of them died in the wilderness.
So most likely Xentherida military and civilian refugees formed communities somewhere in my nation. It might have taken more time to process the military defectors through INS though. Since there were a large number of military defectors, did any take navy ships or other equipment with them? (Like the N Korean pilot that defected with the latest MIG.
Xentherida:
You could have also been a potential supplier of the rebels, or even could have donated troops. And of course, any involvement in the assassination of The Most Glorious Dear Leader would have been welcomed by the rebels; they were moderately disorganized and without any real plan, so leaders of Ceretis could have organized the event for the rebels.
As Plem seems to be in agreement, I think the rebels might have gained support from both Ceretis and Plembobria at some point. I'd assume at first we'd have not been providing support to the rebels. I'm sure there would have been some sort of material support from citizens in Ceretis though. Only after Despota seems to not stop attacking or in some other way makes themselves a thorn in our and at some point Plembobria's side would the rebels probably start getting aid from the governments.
Most likely we'd provide special forces commando types for organizational, leadership, and training personnel rather than all out troops, until maybe the final push at the end. Also, if the border was heavily guarded, there would have been shipments of weapons and such only when it was possible.
Xentherida:
By the way Ceretis, would there have been any potential wars from 1750-1850 that Despotoa could have become involved in?
As far as I can tell at the moment there were a few events. (There may be others as well):
1734 - 1762 Border skirmishes with Frithia
1762 - 1775/1776 Frithian-Ceretian war
1775/1776 - ?1797 Skirmish wars with Pyr, Possible navy battles with Despota
1808 - 1827 TWP Western colonial wars over the 'Polar bear islands' and 'Sedrok territory.' (You are maritime.)
I'd expect your great leader would have tried a few different times to invade by land or sea.
Also I'm open to you attempting to resolve some sort of dispute. When did the original Xentherida exist? That would help determine if it would be a historic or more modern event.