Although on the winning side in the Crimean War, the Ottoman Empire continued to decline in power and prestige. The financial strain on the treasury forced the Ottoman government to take a series of foreign loans at such steep interest rates that, despite all the fiscal reforms that followed, pushed it into unpayable debts and economic difficulties. This was further aggravated by the need to accommodate more than 600,000 Muslim Circassians, expelled by the Russians from the Caucasus, to the Black Sea ports of north Anatolia and the Balkan ports of Constanța and Varna, which cost a great deal in money and in civil disorder to the Ottoman authorities.
The Concert of Europe established in 1814 was shaken in 1859 when France and Austria fought over Italy. It came apart completely as a result of the wars of German Unification, when the Kingdom of Prussia, led by Chancellor Otto von Bismarck, defeated Austria in 1866 and France in 1870, replacing Austria-Hungary as the dominant power in Central Europe. Bismarck did not wish the breakup of the Ottoman Empire to create rivalries that might lead to war, so he took up the Tsar's earlier suggestion that arrangements be made in case the Ottoman Empire fell apart, creating the Three Emperors' League with Austria and Russia to keep France isolated on the continent.
Russia worked to regain its right to maintain a fleet on the Black Sea and vied with the French in gaining influence in the Balkans by using the new Pan-Slavic idea that all Slavs should be united under Russian leadership. This could be done only by destroying the two empires where most non-Russian Slavs lived, the Habsburg and the Ottoman Empires. The ambitions and the rivalries of the Russians and French in the Balkans surfaced in Serbia, which was experiencing its own national revival and had ambitions that partly conflicted with those of the great powers.
Russia ended the Crimean War with minimal territorial losses, but was forced to destroy its Black Sea Fleet and Sevastopol fortifications. Russian international prestige was damaged, and for many years revenge for the Crimean War became the main goal of Russian foreign policy. This was not easy though – the Paris Peace Treaty included guarantees of Ottoman territorial integrity by Great Britain, France and Austria; only Prussia remained friendly to Russia.
In March 1871, using the crushing French defeat and the support of a grateful Germany, Russia achieved international recognition of its earlier denouncement of Article 11 of the Paris Peace Treaty, thus enabling it to revive the Black Sea Fleet.