The presidential debate on Thursday night saw a faltering performance by President Biden and former President Donald J. Trump causing anxiety among America’s allies with a simple shrug. Mr. Trump's regular disparagement of NATO and his refusal to address concerns about his antipathy toward the military alliance during the debate has raised fears among European nations. The debate also highlighted concerns about the U.S.'s global challenges, with little substantial discussion on foreign policy. International observers, including NATO supporters, were unnerved by the back-and-forth between the two candidates. The debate further fueled worries about the future U.S. leadership and its impact on global stability. The article also includes reactions and concerns from various regions, including Europe, Asia, and the Middle East, about the potential impact of the election outcome on international relations and stability.