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過去有關南海問題的研究，多是從法律的角度探討南海主權的紛爭，可是若能配合國家間的互動關係、權力政治、國家利益、衝突等面向，似乎更能有效觀察到整個事件的。因此本論文從這個角度切入來探討南海問題的癥結以及中共南海政策的演變，並從外交與軍事手段的運用分析中共對南海的經營以及對主權的維護。有關南海主權問題的糾紛，不但涉及南海諸島主權歸屬問題，同時也涵蓋了整個海域礦產資源（如石油、天然氣）的開發與漁業資源分配的糾紛。同時南海居太平洋與印度洋的交通要衝，也是亞洲各國經濟發展的生命線。因此，爭端的多邊性，使得南海的局勢更加複雜化。本論文歸納了自中共建政以來同鄰國發生領土主權及國家利益的紛爭，即一九五○年的「抗美援朝」戰爭、一九六二年「中印邊界」戰爭、一九六九年中蘇共「珍寶島衝突」及一九七九年中共「懲越戰爭」。從中共當時的國際環境、國內環境、與對手國的關係演變、決策中心內部的意見為決策產出的依據，並分析其處理過程中外交與軍事手段運用的特質。在探討中共南海政策中外交與軍事手段運用的特質中，筆者從中共海權發展的角度切入，從一九四九年至今，分析中共海軍及其戰略演變以及對於內、外環境的認知和對海洋法態度的轉變，依此決定在同南海週邊國家進行捍衛主權「鬥爭」時所採取的手段。同時對中共爭奪南海加以評估，以作為我國南海政策的參考。

海洋是國家發展的利基，亦是我們賴以生存最重要的憑藉，更是捍衛國家安全的第一道防線。臺灣地處西太平洋第一島鏈中央地帶，戰略地位極為重要，從臺灣的地理特性和地緣位置來看，臺灣的國家安全與海洋是密切相關的，海洋不僅是國家安全的重要緩衝空間，也是維護國家安全的屏障和門戶，控制了海洋即可加大安全縱深，遏止來自於海洋方面的威脅。 臺灣是一個海洋國家，海洋權益的確保、藍色國土的經略乃政府施政的重大目標。今日我們面對海域主權權利、海洋資源、海洋環境等各項層面的威脅及挑戰，需站在戰略及國安的高度展開多面向的海洋戰略(包括尋求國際合作、爭取國際地位等)，並制定國家海洋政策，有效經營海洋資源，方能增進全方位的國家利益，以落實海洋國家發展願景。 行政院海岸巡防署為中華民國開國以來第一個依法定程序設立且律屬於行政院二級部會層級的海域執法專責機關，除海軍以外，為我國第二大擁有海上執法能量的武裝團隊，肩負起維護國家安全、海上治安及救災救難等重責大任；其擁有獨立運作且強而有力的海域司法管轄權，並代表國家執行公權力、伸張海權，以維護國家海洋權益及確保國家安全。 關鍵詞：國家安全、國安戰略、海權、海洋戰略、海洋政策、海軍戰略、地緣戰略、海巡署、海軍、海關 / The sea is the gateway for national development, the most important reliance for our survival, and the first line of defense for national security. Taiwan locates in the middle of the first island chain in the west Pacific with strategic significance. From the geographical points of view, Taiwan's national security closely relates to the sea, which not only acts as important buffer zone for national security, but also safeguards barriers and portals of national security. Controlling the sea deepens the depth of security and deterring threats from the sea. Taiwan is a maritime country. To ensure maritime rights and interests, the governance of Blue Territory is a major goal to the government. Today we are faced with issues such as the sovereign rights of the sea, marine resources, marine environment and other aspects of threats and challenges. It is necessary to take strategic vantage point of national security and expand multi-faceted maritime strategies (including international cooperation and international status, etc.). In order to effectively manage marine resources for all the spectrum of the national interests, national policies and visions of the sea should be developed and fullfilled. The Coast Guard Administration of the Executive Yuan (CGA) is the first ministerial agency of the Republic of China specifically for maritime law enforcement. In addition to the Navy, the CGA has become the country's second largest armed forces responsible for national security, maritime peace and search and rescue, etc. at sea. Representing national authority and sovereignty, it operates independently and holds strongly jurisdiction in sea territories to preserve national maritime rights and interests and to ensure national security. Keywords: national security, national security strategy, sea power, maritime strategy, sea policy, naval strategy, geostrategic, Coast Guard(CGA), Navy, Customs

It is no secret that policy, to a large degree, informs what policy objectives should and can be pursued given a sector or policy domain. However, what happens when multiple levels of policy exist and regulate the same geographical area? The present study explores how complex multi-leveled policy areas affect Environmental Policy Implementation (EPI) and what happens when policy objectives from one level stand against policy objectives on another. By looking at national, supranational, and international policy governing the Swedish Exclusive Economic Zone (SEEZ) and comparing these to the Swedish government decisions on the Nord Stream I and II pipelines (2009 and 2018); the present study has explored to what extent policy objectives and underlying frames from the different policy levels have affected the decisions. The study has worked through the theoretical lenses of Environmental Policy Integration and Frame theory; and has applied thematic analysis and frame analysis methods. The study has concluded that, while policy objectives reflecting strong EPI exist in national policy, the weak EPI of the supranational and international policies policy objectives makes it implausible for effective EPI to be the outcome of decisions in the SEEZ. Without a strong value hierarchy prioritizing environmental objectives, it is unlikely that the Baltic Sea, or other similar multi-leveled policy areas, can achieve sustainable development.