@neuronakaya mostly to limit the aggressors income in case of Russia. As for Iran, no clue honestly.

https://www.reuters.com/business/energy/russias-march-oil-gas-revenues-expected-fall-52-year-on-year-2026-03-17/ for instance: Russia is fairly dependant on oil sales for their national budget, but the lack of option to move it and the sanctions with maximum pricing are hampering the ability to continue the war.

Now, a conspiracy theorist might say bombing middle east oil and gas infrastructure is done to help Russia make more from their oil. But that goes into politics and unproven theories that a certain president is a russian puppet.