But the three strongest nations in the world are the HRE, Russia, and Persia. Actually, you could replace the HRE with Bavaria, depending on advisors. Considering Frosty as one of the strongest nations is again a fallacy. He is spread so far out that he could lose a war against myself or Spain if he were invading us.
For example: I only have a quarter or a third of his manpower, but I have it all in one place. It only takes a month or two to go from Poland to Zadar. It would take Frosty 4 or more months to walk all the way across his empire, and he could never bring 150k to bear against me at one time. I would always have local superiority.