Voted for the Traders and Exploration. Expanding throughout Siberia and dominating the fur trade seems like a good plan.

Quote Originally Posted by SilverLeaf167 View Post
Interesting idea... might work, but vassalizing sworn enemies can be problematic (getting enough opinion for annexation is a pain). Conquering and releasing would fix that, but we'd have to hand over all their cores so it's not that attractive. Besides, we'd have no control over the process. Still, interesting idea.
What if we force-vassalized them, then just waited a while before annexing? We'd want to do that anyways to let them colonize. Penalties for rivalry should go away after vassalization, since I think we won't be a valid rival for them.