FDR's clarity of purpose

From Neptune's Inferno: The U.S. Navy at Guadalcanal by James D. Hornfischer.

The old plan for a Pacific offensive envisioned parallel drives toward Tokyo, one running from New Guinea toward the Philippines, the other through the Central Pacific to the Marianas. Which path received priority for supply, equipment, and reinforcement would depend on the outcome of an important battle yet to be fought—between the U.S. Army and the U.S. Navy. General Douglas MacArthur advocated the New Guinea route; Nimitz and the Navy, the Central Pacific. Though the interservice rivalry was well established, the outbreak of war pitted them in competition for scarce weapons and matériel. As the first American offensive of the war took shape, the warriors in the Pacific would be constantly pleading their cause to those in Washington who rationed the resources.

As it happened, King’s ambitions faced obstacles from those who outranked even MacArthur. FDR himself was said to favor European operations.

As King saw it, the events of early June provided the longed-for opening for a Pacific offensive. While he knew his president would cherish sending his beloved fleet into action, King also knew what Roosevelt’s overriding aim was in the spring of 1941: helping the Russians. In a May 6 memo to the Joint Chiefs of Staff, FDR wrote, “It must be constantly reiterated that Russian armies are killing more Germans and destroying more Axis matériel than all the twenty-five united nations put together. To help Russia, therefore, is the primary consideration.” Despite her infamy, Japan was a negligible threat, Roosevelt thought. With Germany knocked out of the fight, Japan could not hold on, he believed. “The whole question of whether we win or lose the war depends on the Russians,” he wrote in June. “We can defeat the Japanese in six weeks.”

I am not sure I have ever seen, in any of the many histories of WWII which I have read, such a reporting of FDR's clarity, so early in the war, of the importance of the Soviet war effort.