三帝同盟
As part of the foreign policy goals in Europe, Russia initially gave guarded support to France's anti-Austrian diplomacy. A weak Franco-Russian entente soured, however, when France backed a Polish uprising against Russian rule in 1863. Russia then aligned itself more closely with Prussia by approving the unification of Germany in exchange for a revision of the Treaty of Paris and the remilitarization of the Black Sea. These diplomatic achievements came at a London conference in 1871, following France's defeat in the Franco-Prussian War. After 1871 Germany, united under Prussian leadership, was the strongest continental power in Europe. In 1873 Germany formed the loosely knit League of the Three Emperors with Russia and Austria-Hungary to prevent them from forming an alliance with France. Nevertheless, Austro-Hungarian and Russian ambitions clashed in the Balkans, where rivalries among Slavic nationalities and anti-Ottoman sentiments seethed.