Iran had long been a thorn in the side of Europe and the Middle East countries. There is no love lost if the US decides to attack Iran. Most US allies would welcome deposing the current Iranian regime.
The US is anything but isolated. Notice how happy Europe is now that the US is bankrolling the Ukraine war?
Don’t confuse public statements intended for local consumption with what’s happening behind the scenes. Countries will happily talk tough to keep their own people happy all the while partnering behind the scenes.