What are Europe's main security concerns regarding a potential Trump administration?

Europe is deeply concerned that Donald Trump may scale back or entirely withdraw American troops from Europe, particularly from the Baltics where the US has over 5,000 soldiers. This potential withdrawal has sent shockwaves across the continent as European officials see it as a major security risk, especially during the ongoing war in Ukraine. The implications are stark: a potentially weaker NATO, an emboldened Russia with the upper hand on the battlefield, and deepening rifts within the European Union over how to respond. With approximately 100,000 American troops in Europe and nuclear weapons at six NATO bases, European leaders fear that diminished US commitment would fundamentally alter the continent's security landscape at a critical moment.