The executive branch plays a crucial role in shaping foreign policy, primarily through the actions of the president and key advisors. This branch is responsible for diplomatic relations, treaties, and military decisions, enabling swift response to international challenges. The executive sets the tone for how a country interacts globally, leveraging tools like sanctions, alliances, and negotiation tactics. While Congress has the power to declare war and regulate budgets, the executive branch often has the agility to act decisively, making it a dominant force in the realm of global affairs.