To fix this mechanic I propose we introduce another mechanic.
I call it

Shockwave Dragon

Upon arrival, immediately stuns the enemy kingdom for 1 day (1 hour), preventing all provinces from using stealth/mana and prevents the Monarch from performing any duties (declare/surrender/cf/etc).
10% lower income. The loss of 20% of new draftees
Limit to one per utopian month (24 hours).


Think of the possibilities!