No problems there. Yesterday Halicos refused to ever sell food to Madina City again
Realms, no. Halicos, yes. Business opportunity! "Oh, you're starving? Well the added guards to protect from hungry bandits means I have to charge sixty gold per hundred bushels. Sorry!"
Or I just let it starve and don't deal with you greedy bastards.
Port Nebel can't keep itself under control, but being the capital, and being a priest/ambassador with capped oratory skill, I've kept Paisly at premium stats despite multiple days of starvation (not 100%, but still pretty high, nowhere near 1%). I can live with having a few peasants die to ignore opportunists. It's not as if Madina is our only source of food, after all, and it's not as if you guys don't need our trade gold either for your war.
Indeed, it would give us an excuse to side with Aurvandil in order to better secure your food stocks.