

Trust is a lot easier to lose than it is to gain and Europe has lost a lot of trust when it sided with the US when Trump unilaterally exited the last agreement and imposed sanctions.
Further, continued submissive compliance behaviors from Europe towards the US in all manner of things (for example, Tariffs) aren’t exactly helping building in others the trust that in the future Europe will stand fast in such tri-party agreements when America unilaterally tears then down: if Europe won’t even play hardball towards America when an American Administration goes back on bilateral agreements with Europe itself, it will certainly not do so in the interest of a third party in a trilateral agreement involving it and America.
America can’t be trusted because it’s a ultra-nationalist and imperialist country with a growing Fascist side and Europe can’t be trusted because it acts as a spinless coward that won’t even stand-up for itself, much less for others.







I don’t think anything short of making the US lose face will work.
So, it depends on the details of the deal and the reaction of Europe to any push-back from America - Europe has to treat the expressed wishes of America as irrelevant and if America actually pushes back (such as with Tariffs, as has become Trump’s default mode of pressure) it cannot bend in any way form or shape.
Personally from all I’ve seen I believe that at least the EU Commission is unable to act thus and invariably appeases and even supports America and its interests.