does that happen when he's declaring war, does he say it out of the blue, or is that after the drengin AI wins?
In my current game, the altarans and the drengin are the most powerful AI civs, they're right next to eachother, and have been fighting the whole time. Every 3 weeks or so, some other race calls me up and asks me to give stuff to the losing side in that war, which changes frequently. It's like galactic gladatorial combat with everyone else as the spectator. I don't think anyone has noticed how well I have set myself up for the tech win this time.