International alliances can significantly impact national sovereignty by requiring member states to relinquish some degree of control over their policies. Such alliances often necessitate adherence to collective agreements, leading to questions about a nation's autonomy. For instance, participation in organizations like NATO or the EU means that countries must align their military or economic strategies with group consensus. While these alliances can enhance security and economic stability, they also raise concerns about external influence on national governance and the potential erosion of independent decision-making.