Hitler had assured the German people that the Soviet Union would be crushed well before the onset of winter, but that, in fact, did not happen, and there was little in the way of good news. The timing of the Japanese attack on Pearl Harbor enabled Hitler to angle his planned speech to the Reichstag in a more positive fashion, squeezing as much propaganda value out of it as possible. Hitler, in fact, put off the speech – and the declaration of war – for several days, trying to arrive at the proper psychological moment to make the announcement.[25] Still, the propaganda motive was hardly sufficient to justify declaring war on the US, especially considering that doing so would create an otherwise "unnatural alliance" between two disparate and heretofore antagonistic polities, the United States and the Soviet Union.