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The shifting dynamics of international relations under Trump raise critical questions about Europe's security and global order stability. **Summary** As Trump's foreign policy transforms the established world order, European leaders face unprecedented security challenges, prompting discussions about military self-reliance and the future of NATO. The global security landscape is experiencing profound turbulence, likened to a crisis unprecedented since World War II. Experts warn that the ramifications of "Trumpism" could extend far beyond his presidency, leaving Europe scrambling for solutions. Reflecting on a historical moment from February 1947, when the UK withdrew support from Greece, a power vacuum emerged, leading the US to adopt the Truman Doctrine—cementing its role as a defender of democracy abroad. This marked America's rise as the stalwart leader of the free world, buttressed by the Marshall Plan and the establishment of NATO. Fast forward to today, and we witness Trump as the first president to overtly challenge America’s global responsibilities. This shift raises critical questions about which nations are prepared to fill the void left by the United States. As Europe increasingly feels the pressures of insecurity, many of its leaders find themselves at a loss for how to respond adequately to these new threats.Trump's long-standing skepticism towards international alliances and burden-sharing with European allies is evident. His dismissive comments about European nations' reliance on US military support prompted disquiet among European leaders. Leaked conversations revealed dissatisfaction amongst Trump's team regarding European commitments, showcasing a stark divergence in perspectives on defense responsibilities.With Trump’s apparent disengagement from NATO commitments, prominent figures voice fears that Article 5—the alliance's mutual defense clause—may be gravely threatened. Polls in France and other historically pro-US nations reveal growing dissatisfaction with America’s role, suggesting that trust in American security guarantees is eroding. While past US administrations urged Europe to bolster its military capabilities, Trump’s rhetoric has transformed this imperative into a pressing reality. The convergence of his presidency with rising geopolitical tensions, such as the conflict with Russia over Ukraine, highlights a departure from established norms. European leaders are now compelled to aknowledge the need for a more independent defense posture.Experts assert that European nations, having depended on US military might, must reassess their defense strategies and seek to unify their military capacities to face emerging threats. Germany’s leadership is hinting at a pivot towards greater independence, but challenges persist in achieving a cohesive approach across all European nations, especially among diverse interests within the Union. As the landscape of global power is reshaped, the potential for a fragmented Europe looms larger. Some analysts believe it is crucial for Europe to build its own defense industry effectively, while simultaneously navigating inter-European divisions that threaten to stymie progress. Amid uncertainties regarding American support, the onus is on Europe to unite, enhance military spending, and foster a self-sufficient defense model to safeguard against adversarial influences. In a world increasingly reflecting a return to power-centric dominance—similar to pre-World War scenarios—Europe must exercise agency to uphold its shared democratic values.