Donald Trump's return to the White House could have significant implications for global wars and European security. His track record of unpredictability poses challenges for both traditional foes and allies, particularly NATO members. Trump's frustration with the US bankrolling Europe's security has threatened the future of the alliance. In terms of immediate impact, Ukraine and Iran will be most affected by Trump's victory. While Trump has promised to end the Ukraine war, the military aid provided by the US is crucial for Ukraine's resistance against Russia. On the other hand, Trump may back greater US military support for Israel in its conflict against Iran.