Although Russia has such and such problems, Russia at this time is still one of the five most powerful countries in Europe.
The Ottoman Empire is no match for Russia, just as Serbia is no match for the Ottoman Empire.
There are significant disparities between nations, and even with the support of other major powers, these differences in strength cannot be smoothed out.
Unless the British Empire is willing to join this war for the Ottoman Empire, but will the British really join the war? There is a high probability that they won't.
Given the British proclivity for stirring the pot, Britain will strongly support the Ottoman Empire in resisting Russia, perhaps even inciting Austria-Hungary to use force in support of the Ottoman Empire, but it is highly unlikely they will take the risk themselves.
The British, with their pot-stirring nature, have kept Europe in prolonged chaos and mutual competition, but this is also an opportunity for Tsarist Russia.
