British planning to bomb the Caucasus in the war's start:
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Planners identified a dependence by Nazi Germany on fossil fuels imported from the Soviet Union as a vulnerability that could be exploited. Despite initial opposition by some politicians, the French Government ordered General Maurice Gamelin to commence a "plan of possible intervention with the view of destroying Russian oil exploitation", while U.S. Ambassador Bullit informed U.S. President Franklin D. Roosevelt that the French considered that air attacks by the French Air Forces in Syria against Baku would be "the most efficient way to weaken the Soviet Union."[4] According to the report by General Gamelin submitted to the French Prime Minister on 22 February 1940, an oil shortage would cripple the Red Army and Soviet Air Force, as well as Soviet collective farm machinery, causing possible widespread famine and even the collapse of the Soviet Union: "Dependence on oil supplies from the Caucasus is the fundamental weakness of Russian economy. The Armed Forces were totally dependent on this source also for their motorized agriculture. More than 90% of oil extraction and 80% of refinement was located in the Caucasus (primarily Baku). Therefore, interruption of oil supplies on any large scale would have far-reaching consequences and could even result in the collapse of all the military, industrial and agricultural systems of Russia."[4] An important source of raw materials would also be denied to Nazi Germany with the destruction of the oil fields.
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