German Kaiser Wilhelm II dismisses German Chancellor Otto von Bismark from office. Otto von Bismarck had worked hard to maintain peace between Germany, France, and Russia. Now with him gone, Russia expects increased belligerence and threats from Berlin.
This induces Russia to dramatically improve their relations with France, the beginning of a process that will leave Germany isolated at the start of World War I.
Interestingly, Otto von Bismark isn't dismissed because of anything having to do with foreign policy. Instead, he's dismissed over conflicts and disagreements dealing with domestic social and labor policies.