On 25 July 1914, the Austro-Hungarian Ambassador to Russia, Frigyes Count Szapary (pictured), sent a coded telegram to the Austro-Hunarian Minister of Foreign Affairs, Leopold Count Berchtold. In his telegram, Szapary informs Berchtold of the impending Russian mobilisation.
Count Szapary to Count Berchtold. Saint-Petersburg, 25 July 1914.
The Danish Ambassador has learned from a perfectly reliable source that last night orders were given for the [Russian] mobilisation in the border districts against Austria-Hungary and Germany. The military attaché begs that this news will be given to the war department, as he will not send it.
I am told that at the present moment the ministers, with Tsar [Nicholas II] in the chair, are considering the situation in Krasnoje Selo [i.e. the summer residence of the Tsar].
In diplomatic circles, it is reported that the [Russian] representative in Vienna was instructed to ask for a prolongation of the terms to Servia, so that the Powers might have time to study the promised dossier.
Source: 1919 Austro-Hungarian Red Book, with minor edits.