Will Europe be able to provide security guarantees for Ukraine should the United States stop providing aid?

According to Joachim Bitterlisch, European security guarantees for Ukraine are not possible without American security guarantees. He emphasizes that he does not see a scenario where Europeans alone could provide effective security assurances, stating that Europeans are currently unprepared for such a solution. Bitterlisch explains that without the US, Europe would be in a weaker position against Russia. To establish a credible counterforce to Moscow, European nations fundamentally need the United States' involvement and support.