I want to know the answer to the following question:
Why couldn't Petrovich persuade Austria to invade Prussia?
All the background I'm provided with is that "Their real desire, however, was to destroy Frederick’s power altogether, reducing his sway to his electorate of Brandenburg and giving East Prussia to Poland, an exchange that would be accompanied by the cession of the Polish Duchy of Courland to Russia.". Is that enough to answer the question?
Answer: no