The situation in the Balkans, especially in the wake of the 1885 Serbo-Bulgarian War and the 1878 Treaty of Berlin, which made Russia feel cheated of its gains made in the Russo-Turkish War of 1877/8, prevented the League from being renewed in 1887. In an attempt to stop Russia from allying with France, Bismarck signed the secret Reinsurance Treaty with Russia in 1887. This treaty assured that both parties would remain neutral if war broke out. The growing rapprochement between Russia and France and Bismarck's exclusion of Russia from the German financial market in 1887 prevented the treaty from being renewed in 1890, ending the alliance between Germany and Russia.