The Aesiran are still largely unknown to us. Even the decades after Wars End have not changed that. They have not turned away Earth diplomats sent to their borders, but have not invited them any closer to their homeworlds. They are kept quite comfortable on the border worlds with the other races that fill them, and the locals are happy to talk with them about whatever they want to talk about. But the Aesiran do not appear to have a diplomatic service of their own. If they want to talk to us, they generally skip the diplomats entirely and send a representative directly to Earth to deal with our heads of states. They have even offered to take the diplomats home on these trips, much to the chagrin of the various diplomatic services of Earth.