Not to forget that WWII was a war won by oil. Whoever was able to mobilize the most energy (in the form of oil) could win (a great book about that: Oil, Power and War[0]). Retooling in the face of declining energy availability will be a different matter.
We're not going to face declining energy availability for the next few decades. Fighting climate change is in big part a retooling of the energy production, which makes it tricky, but we still have enough dirty sources to burn to replace them with clean ones. Also, at least for now, we're not bombing each other's oil stores too much, so there's that.
[0]: https://www.chelseagreen.com/product/oil-power-and-war/