To partition Poland, it wasn't sufficient for only Prussia and Russia to reach an agreement; it was also necessary to gain the recognition of other European countries, especially to obtain the understanding of France and Austria.
Vienna Palace
Foreign Minister Wessenberg, "Your Majesty, we have reached an agreement with Prussia and Russia. They openly support our unification of the Germany Region in exchange for our neutrality on the Poland issue."
This was not an empty promise, but it was even less reliable than one. If Austria truly moved to unify the Germany Region, the most intense reactions would come from Prussia and Russia.
In the face of interests, such verbal commitments held no binding force; whether they could be fulfilled depended entirely on everyone's integrity.
