This question cannot be answered by simple economic theory, and there are complex relations behind the war.

The theoretical answer upstairs lacks reference. Let me analyze its essence, and throw a brick to attract jade ~!

After the financial crisis, the United States needs to rebuild its leading position in the international economy through a strong dollar. Before the financial crisis, the United States linked the dollar to oil, but after the financial crisis, the United States tried to link the dollar through new media (such as carbon trading), and failed to achieve the expected results. Therefore, the premise of a strong dollar is that oil and gold should be strong, because in international trade, oil and gold are traded in the same currency. As long as the prices of oil and gold rise, there will be more dollars, and people will change other currencies into dollars, so that the dollar will continue to maintain its position as a strong currency.

Then the easiest way to make a fuss about petrodollars is to manipulate them directly through the New York Futures Exchange, which requires a speculative reason. Undoubtedly, the war in oil countries is the best reason. Therefore, Syria's problem is, on the one hand, its domestic dictatorship and, on the other hand, its incitement to influence from abroad.

In modern finance, local wars are not necessarily related to currency prices.