Why wouldn't we let the foreign dignitaries leave should they desire to? Wouldn't want to provoke the Da-Hyun by imposing on their representatives.

Of course, if I were those erstwhile ambassadors, I'd seize on the chance to create diplomatic relations with the invaders (and probably more importantly, learn as much as I could about them. Like, say, if they are a threat.)

While I cant say I am a master of this particular area (political machination), Alessia being something of a departure from my usually more combat oriented characters, I am also no stranger to plotting... Take that as you will.