 On 16 April 1922, Germany and the Soviet Union entered the Treaty of Rapallo in which they renounced territorial and financial claims against each other.Each party also pledged neutrality in the event of an attack against the other with the Treaty of Berlin (1926).While trade between the two countries fell sharply after World War I, trade agreements signed in the mid-1920s helped to increase trade to 433 million Reichsmarks per year by 1927.