In my game, Poland became a snake and ate all the way through to Ming and Manchu. Currently, it's my ally as well and not really a threat (Burgundy is) because it didn't Westernize. However, if I want to conquer it, how many wars does it take? Maybe 20? Do you think I am better off waiting to force it into a PU? It appears to me that PU cost is always below 100%, but the biggest country I've PU in any of my games is Prussia (~ Teutonic order in size) and England. Even occupying all of its steppe provinces seem like a big hassle let alone doing it a few dozen times.