FDR's sanctions deprived Japan of the resources it needed to wage an offensive war. That gave the Japanese two options: 1. Stop its expansionism, or 2. Seize the resources it needed to wage an offensive war, by expanding its offensive war. I don't think FDR bears any responsibility because the Japanese chose to expand their war. I think that FDR, and his civilian and military advisers, bear a lot of responsibility for not adequately preparing for what would happen if the Japanese chose option 2.
There is an excellent book titled The New Dealers' War: The war within WWII by Thomas Freeman. He makes a compelling case that FDR got into the war and fought it in a way to save Joe Stalin's butt. Hitler had attacked him from the west and Japan was posing a threat on the eastern front. Freeman says that FDR had outfitted an old sailing ship with a cannon, put in under an American flag, put a young Navy Lt in charge, making it a U.S. warship, and sailed it into Japanese waters trying to instigate an incident with Japan to give us the excuse to enter the war. Japan saved him the trouble and attacked Pearl Harbor but never spotted the sailing ship.
As we have learned since, there were lots of Communists and Communist sympathizers in FDR's administration. Additional pressure was exerted by his wife.
How can you step up your offensive war if you’re deprived of the means to do so?