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You could intervene for the weakest side (Protestants, usually), or perhaps remain neutral, and fall over Europe right after the war ends and everybody is exhausted? What's the best decision for Russia? And in Poland's/Commonweath's case?
As PLC remind those Germans that they belong on the Western side of the Limes Saxoniae
Otherwise go for modern day Poland's Western borders. They're neat, easy to fortify, include rich Silesia, and protect your core territories well.