Freeciv

In https://forums.civfanatics.com/threads/civ2-scripting-guide.7001 Civ2 scripting, there is a NEGOTIATION trigger that blocks meeting (and thus peace treaty) between any or specific players. We could make some script callback on meeting with a mechanism to prevent the meeting to happen (passing a table checking then a field? inserting local method into Lua closure?), or just make "No_Diplomacy" effect dependent on the other player. Maybe this should be a part of some advanced diplomacy control mechanism with also Civ2 Great Wall effect.