Between the date the invitations to the conference went out (29 November) and the date of the cancelled first meeting (9 December), the situation changed. On 5 December 1941, the Soviet Army began a counter-offensive in front of Moscow, ending the prospect of a rapid conquest of the Soviet Union. On 7 December 1941, the Japanese attacked the United States at Pearl Harbor, causing the U.S. to declare war on Japan the next day. The Reich government declared war on the U.S. on 11 December. Some invitees were involved in these preparations, so Heydrich postponed his meeting. Somewhere around this time, Hitler resolved that the Jews of Europe were to be exterminated immediately, rather than after the war, which now had no end in sight. At the Reich Chancellery meeting of 12 December 1941 he met with top party officials and made his intentions plain. On 18 December, Hitler discussed the fate of the Jews with Himmler in the "Wolfsschanze". Following the meeting, Himmler made a note on his service calendar, which simply stated: "Jewish question/to be destroyed as partisans".