The Austrian Empire
To the Kingdom of Prussia, your suppositions are untrue and are not grounded in reality. Austria has never turned away from the German states with whom it has deep and historic ties, indeed it has just recently renewed its guarantee on them from outward aggression. Hostile acts towards them are considered hostile acts on Austria. The Treaty of St. Petersburg serves several purposes each of which benefit the German states. The trade agreement only brings Russian goods in line with those of the German states, and more importantly opens up vast reserves of resources to feed not only Austrian industry but also the needs of the German states. Furthermore, the defensive agreement with Russia only serves to protect the interests of these states, as its Austria acting in their defense. Additionally, it aids Austria in preforming it's historic duty of serving as a bulwark for the German states against the aggressions of the Turk. On the matter of the Zollverein, the Prussian position is without factual basis. The Zollverein is merely a tool for the machinations of the Prussian Kingdom against the German states. It serves to tightly bind the German states to Prussia, removing their autonomy and, ultimately, the ceding of economic independence to Prussia. The fact that Austria is not a member of the Zollverein is not due to the choice of Austria nor some political accident but a calculated ploy by Prussia to remove it's only counter balance and to stifle the will of the Germanic people!
To the German states, we hope to continue our long and historic ties to your nations. We hope that our renewed guarantees on your nations can serve as proof of our desire for increased cooperation sand closer diplomatic and economic ties with your nations. We also hope that you can see through the lies of the Prussians who only seek to weaken and divide you. The Zollverein is proof of this, it makes you subservient to them and only broadens the power held over your nations. This is why Austria is not a member of the Zollverein, this why Prussia is seeking this meeting, to further weaken you and reinforce Prussia's dominance, extended it not only from the economic but also the political sphere. Stand up Germans do not be lulled by the deceitful words of the Prussian!
To the Russian Empire, we are gladdened at the ratification of the treaty and look forward to increased cooperation.
OOC: Hope this clear, posting from my phone, and it's already eaten two other attempts at posting.