Trusted allies in 1.02

[Tran]

Sea invasion is handled by "can_force_invade=true" in the code.

Does it mean if we change the code into "can_force_invade=false" the ally or other faction won't backstab/attack in a non-sense way by sea?

- If you are a trusted ally: 90% chance no invasion.

What's the clasification or requirement for being a trusted ally?