Sorry, but this article doesn't make sense to me.

The term "supply" refers to the amount of oil produced.

"Demand" refers to the desire to consume oil.

The war decreased the supply of oil. Because of the decrease in supply, prices have started to rise rapidly.

Since oil is a limited resource and since it causes pollution, a decrease in demand is a good thing. This is why people are putting up solar panels, wind farms and taking other steps to decrease fuel consumption.