Being neighbors with a country that ended its civil war through force, purified its race and ideology, where everyone is a warrior?
That would absolutely be a nightmare, and it goes beyond the advancement of military technology.
Because they're right next door, adjacent to the Federation.
No one can withstand a long border; people can't turn the border into an insurmountable high wall. As long as they can't do that, invasions and harassment from Mariluo will be a perpetual threat.
They don't need to invade in organized masses; invasions by the elderly, children, adults, or even families are difficult to defend against.
Once their desires for plunder and slaughter are satisfied, they can retreat, and the Federation people can't interfere or obstruct this in any way!
Because those are not "soldiers," they are "civilians."
