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Negrín relied on the Communists to curtail the Anarchist wing of the Spanish Left, and was forced to rely on the Soviet Union, then led by Joseph Stalin, for weapons and armament, because of the arms embargo imposed by the Non-Intervention Committee.
On June 15, Germany denounced a supposed Spanish Republican Navy attack against the German cruiser Leipzig, and on June 23 Germany and Italy withdrew from the Non-Intervention Committee and Portugal withdrew the British observers on its frontier.
During the Spanish Civil War, several countries followed a principle of non-intervention, which would result in the signing of the Non-Intervention Agreement in August 1936 and the setting up of the Non-Intervention Committee, which first met in September.