The <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Russian_Empire">Russian Empire</a>'s entry into <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/World_War_I">World War I</a> unfolded gradually in the days leading up to July 28, 1914. The sequence of events began with <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Austria-Hungary">Austria-Hungary</a>'s declaration of war on <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Kingdom_of_Serbia">Serbia</a>, a Russian ally. In response, Russia issued an ultimatum to <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Vienna">Vienna</a> via <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Saint_Petersburg">Saint Petersburg</a>, warning Austria-Hungary against attacking Serbia. As the conflict escalated with the invasion of Serbia, Russia commenced mobilizing its reserve army along the border of Austria-Hungary. Consequently, on July 31, <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/German_Empire">Germany</a> demanded that Russia demobilize. When Russia did not comply, Germany declared war on Russia on August 1, 1914. According to its <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Schlieffen_Plan">war plan</a>, Germany prioritized its offensive against <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/French_Third_Republic">France</a>, declaring war on August 3. Germany deployed its main armies through <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Belgium">Belgium</a> with the aim of encircling <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Paris">Paris</a>. The imminent threat to Belgium prompted <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/British_Empire">Britain</a> to declare war on Germany on August 4.<a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Russian_entry_into_World_War_I#cite_note-1">[1]</a><a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Russian_entry_into_World_War_I#cite_note-2">[2]</a> The <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Ottoman_Empire">Ottoman Empire</a> subsequently joined the <a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Central_Powers">Central Powers</a> and engaged in warfare against Russia along their shared border.<a target="_blank" rel="ugc" href="https://en.wikipedia.org/wiki/Russian_entry_into_World_War_I#cite_note-3">[3]</a>

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