Sorge supplied Soviet intelligence with information about the Anti-Comintern Pact and the German-Japanese Pact. In 1941, his embassy contacts made him learn of Operation Barbarossa, the imminent Axis invasion of the Soviet Union and even the approximate date. On 30 May 1941, Sorge reported to Moscow, "Berlin informed Ott that German attack will commence in the latter part of June. Ott 95 percent certain war will commence". On 20 June 1941, Sorge reported: "Ott told me that war between Germany and the USSR is inevitable... Invest code name for Ozaki told me that the Japanese General Staff is already discussing what position to take in the event of war". Moscow received the reports, but Stalin and other top Soviet leaders ultimately ignored Sorge's warnings, as well as those of other sources, including early false alarms.