The sudden and decisive battle not only disrupted the layout of the Vienna Government but also broke the plans of the British.
In this world, it is always "easy to add flowers to brocade, difficult to send charcoal in snowy weather." Prusso-Russian forces had already begun the decisive battle, and the London Government had no time to help them draw allies.
The tendency to weigh pros and cons is a natural human instinct and is no exception in international political diplomacy since it is people who make the decisions in politics and diplomacy.
Whether it is the Central Asian Countries, the Ottoman Empire, or the German Federation, they would all choose to observe the situation at this time.
If the Prusso Federation failed in the battle, the war would end prematurely. The Berlin Government wouldn't have the strength to organize a second battle, and the Russians would not give them the time.