Why did Germany allow the Reinsurance Treaty with Russia to lapse after Bismarck’s departure?

After the dismissal of Otto von Bismarck in 1890, his successor, Leo, Graf von Caprivi, chose not to renew the Reinsurance Treaty with Russia. This decision was driven by several key factors:

• Strategic Realignment: Caprivi and the German leadership believed that ideological differences and a lack of common interests would prevent republican France and tsarist Russia from forming an alliance, despite the treaty's lapse.1
• Diplomatic Ambitions: Caprivi aimed to bring Great Britain into the Triple Alliance as a fourth partner. He hoped to secure British support and cooperation, particularly regarding colonial interests and naval security, which he viewed as incompatible with the secret, pro-Russian commitments of the Reinsurance Treaty.2
• Policy Shift: The move was intended to break the partnership between the Russian tsardom and the Prussian Junkers, which had been a cornerstone of Bismarck’s foreign policy. Caprivi sought to pursue a "new course" that prioritized broader European alliances over Bismarck’s complex system of secret agreements.2

Ultimately, this decision backfired, as it removed a critical barrier to cooperation between Russia and France, leading to the formation of the Franco-Russian alliance and leaving Germany vulnerable to the "two-front" threat Bismarck had worked to avoid.31