RM invades Omega 3, BAF shoots them, Bretgov sends an angry letter to Rheingov. Rheingov doesn't respond. BAF sends ships to Omega 7 next day, RM shoots them and invades Omega 3. How far can Bretonia go diplomatically? I suppose a declaration of war is out of question, but can Bretonia consult with Liberty about this? Can Bretonia impose sanctions?
Another scenario: RM catches IMG pirating Kruger in Omega 7. IMG manages to escape to Omega 3, where they pirate BMM in front of BAF's eyes. Can Rheinland and Bretonia declare IMG as unwelcome or even nationalise their assets? I think this would be harmful for gameplay because it would effectively remove the IMG from their two main Houses, but I am sure some players would disagree with me and I don't see any line about RP consequences.