by Bulgarian and Serbian government, Treaty Of Friendship And Alliance Between Bulgaria And Serbia (1912)
“ In case Russia does not give its opinion and an agreement between the two contracting parties cannot, even after that, be reached, and in case the party which is in favour of action decides to pursue such action alone and at its own risk, the other party shall be obliged to observe a friendly neutrality towards its ally, to proceed at once to mobilize its troops within the limits provided by the military convention, and to go to the assistance of its ally with all its power, if a third State takes the part of Turkey. ”
