Editing Client state (section)

===Russian Empire===
{{main|Russia–Serbia relations}}
[[Austria-Hungary]] tried to make [[Kingdom of Serbia|Serbia]] a client state in order to form a [[Christianity|Christian]] opposition to the [[Ottoman Empire]], but after the 1903 [[May Coup (Serbia)|May Coup]], Serbia came under the influence of [[Russian Empire|Russia]], which was forming a pan-[[Eastern Orthodox Church|Eastern Orthodox]] opposition to the Latin Christianity represented by the Austro-Hungarian Empire. In 1914, Russia repeatedly warned Austria-Hungary against attacking Serbia. When it did attack, Russia mobilised its army.<ref>Russian Foreign Minister [[Sergey Sazonov]] warned Austria in 1914 that Russia "Would respond militarily to any action against the client state." Christopher Clark, ''The Sleepwalkers: How Europe Went to War in 1914'' (2012) p 481.</ref><ref>{{cite book|author=Thomas F. X. Noble|display-authors=et al|title=Western Civilization: Beyond Boundaries, Volume C: Since 1789|url=https://books.google.com/books?id=b1PTCQAAQBAJ&pg=PA692|year=2010|publisher=Cengage|page=692|isbn=978-1424069606}}</ref><ref>{{cite book|author=Michael J. Lyons|title=World War II: A Short History|url=https://books.google.com/books?id=LYqTDAAAQBAJ&pg=PA3|year=2016|publisher=Routledge|pages=3–4|isbn=9781315509440}}</ref> Russia also wanted [[Kingdom of Bulgaria|Bulgaria]]<ref>{{cite book|author=Barbara Jelavich|title=Russia and the Formation of the Romanian National State, 1821–1878|url=https://books.google.com/books?id=clLtuNxa1cgC&pg=PA288|year=2004|publisher=Cambridge UP|page=288|isbn=9780521522519}}</ref> and [[Kingdom of Montenegro|Montenegro]]<ref>{{cite book|author=Clive Ponting|title=Thirteen Days: The Road to the First World War|url=https://books.google.com/books?id=a9BmAAAAMAAJ|year=2002|publisher=Chatto & Windus|page=60|isbn=9780701172930}}</ref> as client states.

At the time, [[United Kingdom of Great Britain and Ireland|Great Britain]] and Austria-Hungary both considered Serbia as a client state controlled by Russia.<ref>{{cite book|author=Henry Cowper|title=World War One and Its Consequences|url=https://books.google.com/books?id=l9VmAAAAMAAJ|year=1990|publisher=Open University Press|page=209|isbn=9780335093076}}</ref>