Except Europe had little sovereignty when it came to Ukraine policy. What they could and couldn't give was directly dictated by America.
That's why what Trump is saying is coming across as such a betrayal in European politics. They expected their obsequiousness to previous American policy to be rewarded, instead they are expected to make a complete 180 policy shift and sell it to their populace. For 3 years all European propaganda has been directed at calling Putin the new Hitler. Now they're expected to make peace with Russia and China is the bad guy.
It's like 1984's "Oceania has always been at war with Eurasia".
The only limitation on European policy toward Ukraine is on the subject of NATO, where accession requires unanimous consent. Yet the diplomatic history prior to the 2022 invasion has been well established at this point: Germany and France led the faction of nations that were sensitive to Russia's "red lines" regarding Ukraine and effectively obstructed progress towards NATO accession, while the United States led the faction (including, to be fair, some European nations) backing Ukraine in pushing for NATO accession and thereby, as we now know, along the path to war. As Washington was never the limiting factor on bringing Ukraine into NATO, even this theoretical limitation is, in practice, no limitation at all. Everything else is within the sovereign grasp of each European nation, including force generation and force deployment.
Trump daring to acknowledge the uncomfortable reality of the situation should not be a shocking development. What is shocking is that it has required hundreds of thousands killed and wounded in direct combat, many millions suffering indirectly, and a starkly diminished Ukrainian nation facing a prospective recovery bill in the hundreds of billions of dollars, to bring us to the present juncture whereby that reality can actually be publicly acknowledged. The performative outrage from leaders of nations most of whom (a) privately recognised the folly of attempting to bring Ukraine into NATO long ago and (b) have
chosen not to invest in the capabilities that would be required to shape outcomes in this conflict without the United States, naturally invites the question: what alternative course of action would they suggest? A continuation of the status quo that appears to be significantly more sustainable for Russia than it is for Ukraine? A doubling or tripling down on external material support for Ukraine despite the comprehensive failure of most European governments to prepare their nations for wartime production (let alone wartime service) to date? To deploy and bring extant European forces into direct conflict with Russia, thereby risking nuclear escalation?
If European nations had actually treated the Ukraine conflict as the existential wartime crisis for Europe that they have told us that it is, defence spending would've absolutely
skyrocketed these last few years to integer multiples of pre-2022 spending and, with even modest coordination between only a few of the larger European powers, we would not now be in the position whereby the whims of Donald Trump have a decisive bearing on the prospects for sustaining Ukraine in that conflict. The helpless passivity of European nations and the diplomatic indignities associated with that are not iron laws of history or physics, but the outcome of deliberate choices that European nations have made over years and decades.