Urgh, a country that is dependent on only one thing won't last. A country that has not have an army for generations will not know how to pick up arms to protect themselves when their protector can no longer protect them. It's fine if they're completely at peace like Lichtenstein, but every surrounding country is watching them like a wolf. Facades can only go so far.
If I was the king, I'd tell Maika straight up that marrying her was my excuse to raise an army, telling everyone else that she feels secure with an army protecting the border or something like that.