Honestly this feels like it could just be an empty threat.
Envoy prince guy talks all big bout not being able to stand seeing his people starve but if his country is going through a drought and running out of food then forcing a war with dwindling resources is the last thing you should do if you really cared about your people.
Even more so that they came over on their own, didn’t even try offering for anything in exchange other than future backing, and then threatening them, what kinda rapport are they trying to build here??. This other country is really coming of self entitled with no backing for why, like do they provide an essential resource? (Eg gold, oil..) or are they like historically known to be great in wars?? It wouldn’t be unusual for countries to have animosity either so would refusing really be that big of a deal.....
Orrrr maybe they explain next chap why it’s so important