On April 24, 1926, Weimar Germany and the Soviet Union concluded another treaty (Treaty of Berlin (1926)), declaring the parties' adherence to the Treaty of Rapallo and neutrality for five years. The treaty was signed by German Foreign Minister Gustav Stresemann and Soviet ambassador Nikolay Krestinsky. The treaty was perceived as an imminent threat by Poland (which contributed to the success of the May Coup in Warsaw), and with caution by other European states regarding its possible effect upon Germany's obligations as a party to the Locarno Agreements. France also voiced concerns in this regard in the context of Germany's expected membership in the League of Nations.