How is the role of US leadership in European security changing with regard to Ukraine?

The US appears to be shifting from its traditional leadership role in European security to one where European nations must take the lead in supporting Ukraine against Russia. Marc Polymeropoulos expresses concern that the United States is 'abrogating' its 80-year leadership position in Europe, calling it a 'shocking development' compared to just a few weeks before the election. This transition represents a significant geopolitical shift, with Polymeropoulos worried that the US is becoming more neutral in the conflict. He emphasizes that it will now be 'in the hands of the Europeans' to ensure Ukraine can maintain its struggle against Russia, marking a fundamental change in transatlantic security relationships.