Why did all major German political parties support the Treaty of Berlin in 1926?

The Treaty of Berlin, signed in April 1926, received unanimous support from all major German political parties, including those on the right, because it served as a vital diplomatic reassurance.1

While Gustav Stresemann’s agreements with Western powers—such as the Pact of Locarno—were often viewed with suspicion by domestic critics and the Soviet Union, the Treaty of Berlin successfully confirmed and extended the friendly relations previously established by the Treaty of Rapallo. By signing this treaty, Stresemann effectively alleviated Soviet fears that Germany might join an anti-Soviet bloc, thereby maintaining a balanced foreign policy that satisfied both nationalist concerns about Eastern relations and the broader political consensus regarding Germany's international standing.21