Thanks, as to the khan he appeared back in bakhchisaray a few days later, I was a little hasty...
But I can't just go conquering castles now, since crimea isn't at war with anyone. Also, I temporarily conquered sich and kiev alone while the war endured, and in both cases the king only gave me 1200 thalers - even though I didn't even have any fiefs at all in those situations (a few days later he gave me a village near the town instead).