美发布国防战略报告，本土安全及其在西半球利益为最优先事项

Core Viewpoint - The U.S. Department of Defense's 2026 defense strategy report prioritizes homeland security and interests in the Western Hemisphere, emphasizing the need to strengthen alliances and develop the defense industrial base [1] Group 1: Homeland Security and Western Hemisphere Focus - The Pentagon identifies the protection of the U.S. homeland as its primary mission and aims to restore military dominance in the Western Hemisphere [1] - The report outlines plans to ensure border security, combat "drug terrorists" in the Western Hemisphere, and maintain control over key regions from the Arctic to South America, particularly Greenland, the U.S. Gulf, and the Panama Canal [1] Group 2: Defense Capabilities and Modernization - The Department of Defense will prioritize the development of the Iron Dome missile defense system and capabilities to counter drone systems, as well as modernizing and adapting U.S. nuclear forces [1] - The report highlights the importance of enhancing cyber defenses for both military and certain civilian objectives [1] Group 3: Global Threats and Alliances - Russia is described as a controllable threat to NATO's eastern members, possessing the largest nuclear arsenal and capabilities to attack the U.S. homeland [2] - The report asserts that NATO allies are capable of taking primary responsibility for conventional defense in Europe, with the U.S. providing limited support [2] - The U.S. will continue to play a key role within NATO while adjusting troop deployments and actions in Europe [2] Group 4: Regional Security Concerns - The report emphasizes that Iran must not be allowed to acquire nuclear weapons and notes Iran's determination to rebuild its conventional military despite recent setbacks [2] - The U.S. will support Israel's defense capabilities and deepen cooperation with Gulf Arab states to enable regional allies to deter and defend against Iran [2] - North Korea poses a direct military threat to South Korea and Japan, with its nuclear capabilities increasingly threatening the U.S. [2]