Maybe Putin is using his fossils fuels as a weapon of war. But one nationalist leader above all enables the energy starvation of the EU economy, namely Biden's country, which is profiting from European misery by selling fossils fuels at more than 4 times the market price.
Without Biden's support, Putin's weapon would lose it teeth.
The EU cannot affect what is happening in China or India. But it can affect the prices of what enters the EU.
In other words, to save itself and neutralize Putin, EU should impose a price cap on American gas.