Tsar Nicholas II of Russia was already angry with Bulgaria because of the latter's refusal to honor its recently signed agreement with Romania over Silistra, which had been the result of Russian arbitration.
Tsaar Nikolai II oli juba Bulgaaria peale vihane, kuna viimane jättis täitmata hiljuti allkirjastatud kokkuleppe Rumeeniaga Silistra kohta, mis saavutati tänu Vene vahekohtule.