I admit it. I am a n00b. Then again, this ambassador thing is new to most of us, isn't it?
What is the difference between having my realm propose a treaty to two other realms, and having two different treaties, one for each realm?
I think I should have drafted two different open border treaties, one with D'Hara and another with Terran, instead of having a "oh, let's the three of us be good neighbours" treaty involving Barca, D'Hara and Terran. RP-wise, I decided that it would be more interesting to have meetings and discussions and agreement between three realms.