On 25 July 1914, the Russian Chargé d’Affaires (the defacto Ambassador) to Austria-Hungary, sent a telegram to the Austro-Hungarian Minister of Foreign Affairs, Leopold Count Berchtold (pictured) as he was travelling to meet the Austro-Hungarian Emperor at Ischl. In his short telegram, the Russian Chargé d’Affaires asks for a prolongation of the terms of the Austro-Hungarian ultimatum to Serbia.
The Russian Chargé d’Affaires to Count Berchtold. (Adressed Fast train between Linz and Ischl, Austria). Vienna, 25 July 1914.
I am urgently instructed to ask the Imperial and Royal Government for a prolongation of the term fixed in the [Austro-Hungarian] ultimatum to Servia.
Kudacheff, Russian Charge d’Affaires.
Source: 1919 Austro-Hungarian Red Book, with minor edits.