That seems to be pretty standard behaviour for the Mongols and the Tims. I'm not sure why its a problem though, I just let them get on with it.
The only time it did become a real issue for me was in my Russian campaign when I was hoping that first the Mongols and then the Tims would be co-operative and finish off the Polish whose last city was Antoich for me.
Neither of them obliged and in the end I had to bribe a local Polish General to do the dirty deed on my behalf.
Bookmarks