Than US did act unilateraly by far more than any european country with their sience project. Read what tfbm said.
And i limit my definitions to dictionary explanations and not to what would fit me and my wishfull thinking best. Its beyond me why are u so obsessed with finding in europe what isnt there. Well at least your looking in wrong places...
And yes, some countries did act unilateraly during Iraq conflict... they were in the "coalition of the willing" (idiotic term to begin with, shows nothing but which countries would suck up to US and would ignore their own ppl just for that).