European leaders are convening for the 2026 NATO summit in Ankara, Turkey, to address significant shifts in the alliance's strategic structure. Amidst potential US troop withdrawals and changing global priorities under President Donald Trump, the alliance is transitioning toward "NATO 3.0." This new framework encourages Europe to take a more prominent role in conventional defense, reducing its historical reliance on Washington. While maintaining US nuclear deterrence and leadership for stability, Europe must now focus on increasing military spending and enhancing overall capabilities. However, several critical challenges remain, including underfunded European armies, slow defense integration, and the urgent necessity for a unified command structure. These developments are essential for the alliance to respond effectively to growing threats from Russia and China while ensuring long-term stability within the evolving geopolitical landscape.