I've asked this (about the diplomatic stance of Kartli) before and the response of Foot was:


Quote Originally Posted by Foot View Post
Kartli was in an alliance with AS against Hayasdan. But it wasn't an active war as far as we can tell. Hayasdan had just supported the King of Kappadokia against the AS, and so the AS needed to keep an eye on Hayasdan. To do this they gave support to Kartli. They weren't at war, but they weren't best of friends either. Had Hayasdan become agressive, she would have been caught in a pincer between the two nations. Kartli, on the otherhand, had a bit more free reign and was beginning to move into the colchis region (which, at the time, was ruled by a lot of little minor princes, rather than a unified land.

Foot