Wiki says:
Operation Pike was the code-name for a strategic bombing plan, overseen by Air Commodore John Slessor, against the Soviet Union by the Anglo-French alliance. British military planning against the Soviet Union occurred during the first two years of the Second World War, when, despite Soviet neutrality, the British and French came to the conclusion that the Nazi–Soviet pact made Moscow an accomplice of Hitler. The plan was designed to destroy the Soviet oil industry, to cause the collapse of the Soviet economy and deprive Nazi Germany of Soviet resources.
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
The earliest start date of the bombing campaign would have been March 1940. Knowing full well it is difficult to destroy an oil field, we need to acknowledge the following: "The French diplomat René Massigli, in a report to Paris, noted that American oil engineers observed "as a result of the manner in which the oil fields have been exploited, the earth is so saturated with oil that fire could spread immediately to the entire neighboring region; it would be months before it could be extinguished and years before work could be resumed again"
Here is then the case: The destruction starts in March 1940 and the region's oil output is drastically reduced (let us say reduced with 80%).
Germany invades France as OTL in May 1940.
Impossible scenarios:
Stalin has declared war on UK: So Germany and USSR are fighting the same enemy in 1940?
Operation Pike was the code-name for a strategic bombing plan, overseen by Air Commodore John Slessor, against the Soviet Union by the Anglo-French alliance. British military planning against the Soviet Union occurred during the first two years of the Second World War, when, despite Soviet neutrality, the British and French came to the conclusion that the Nazi–Soviet pact made Moscow an accomplice of Hitler. The plan was designed to destroy the Soviet oil industry, to cause the collapse of the Soviet economy and deprive Nazi Germany of Soviet resources.
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
The earliest start date of the bombing campaign would have been March 1940. Knowing full well it is difficult to destroy an oil field, we need to acknowledge the following: "The French diplomat René Massigli, in a report to Paris, noted that American oil engineers observed "as a result of the manner in which the oil fields have been exploited, the earth is so saturated with oil that fire could spread immediately to the entire neighboring region; it would be months before it could be extinguished and years before work could be resumed again"
Here is then the case: The destruction starts in March 1940 and the region's oil output is drastically reduced (let us say reduced with 80%).
Germany invades France as OTL in May 1940.
Impossible scenarios:
Stalin has declared war on UK: So Germany and USSR are fighting the same enemy in 1940?