This question now bothers me as well. I play 1200-ish bookmark in East Europe, when lot of lands are owned by Golden Horde. They are way weaker than Ilkhanate (no event troops anymore), but still quite powerful and I am not sure how to destroy them.
Recently they took Duchy of Novgorod too. They do not attack me (Lithuania) yet, but I need to take Briansk from them (alternatively Rugen from HRE... which is way too impossible) to reform Romuva.
Recently they took Duchy of Novgorod too. They do not attack me (Lithuania) yet, but I need to take Briansk from them (alternatively Rugen from HRE... which is way too impossible) to reform Romuva.