Well duh, EU GDP is like 3000x Russian one, Italy alone is richer than Russia, so ofc EU military combined is greater than Russia.
Russia is broke gas station with nukes, not really a benchmark for military supremacy.
The US regime has no support from its voters and taxpayers to get deeper into the IRan war because the US is the one who started it, it's not an existential threat for Americans in the US to spend more of their money or die intervening in the middle east.
But for EU what happens in Ukraine is an existential threat and they also didn't provoke the war there, so Europeans are more motivated to support the war against Russia than AMericans are to support military intervention in Iran.