The two most authoritative sources for intelligence for the Soviet Union on Germany in the late 1930s were Sorge and Rudolf von Scheliha, the First Secretary at the German embassy in Warsaw. Unlike Sorge, who believed in communism, Scheliha's reasons for spying were money problems since he had a lifestyle beyond his salary as a diplomat, and he turned to selling secrets to provide additional income. Scheliha sold documents to the NKVD indicating that Germany was planning from late 1938 to turn Poland into a satellite state, and after the Poles refused to fall into line, Germany planned to invade Poland from March 1939 onward. Sorge reported that Japan did not intend for the border war with the Soviet Union that began in May 1939 to escalate into all-out war. Sorge also reported that the attempt to turn the Anti-Comintern Pact into a military alliance was floundering since the Germans wanted the alliance to be directed against Britain, but the Japanese wanted the alliance to be directed against the Soviets. Sorge's reports that the Japanese did not plan to invade Siberia were disbelieved in Moscow and on 1 September 1939, Sorge was attacked in a message from Moscow: