1. Triple Alliance:
- Germany
- Austria-Hungary
- Italy (until 1915)
2. Triple Entente:
- United Kingdom
- France
- Russian Empire
a) Franco-Russian Alliance (1894): A defensive alliance between France and Russia, where each party agreed to provide military support in case of war with Germany or Austria-Hungary.
b) Anglo-French Entente Cordiale (1904): An informal understanding between the United Kingdom and France, improving diplomatic relations and resolving colonial disputes.
c) Anglo-Russian Entente (1907): An agreement between the United Kingdom and Russia to resolve outstanding territorial disputes in Central Asia and to cooperate on diplomatic issues.
The intricate web of these alliances created a situation where tensions and conflicts in one region could quickly escalate into a wider European conflict. For instance, when Austria-Hungary declared war on Serbia following the assassination of Archduke Franz Ferdinand in 1914, Russia, as Serbia's ally and bound by the Franco-Russian Alliance, felt obligated to mobilize its forces in support. Germany, in turn, felt compelled to support Austria-Hungary, its ally in the Triple Alliance. This chain reaction of military mobilization ultimately led to the outbreak of World War I.