US National Security Strategy: New Concerns about Isolationism

Published in Tokyo Shimbun
(Japan) on 12 December 2025
by (link to originallink to original)
Translated from by Dorothy Phoenix. Edited by Patricia Simoni.
President Donald Trump's second administration has officially released its National Security Strategy. The contents of the document further intensify the “America First” doctrine, and one cannot help but feel apprehensive about what is effectively a declaration of departure from the cooperative structure that has been the basis of the postwar international order.

The U.S. NSS is established each time a presidential administration takes office, and even though the U.S.' traditional diplomatic policy, which emphasized relations with allied nations, remained in effect for the first Trump administration's NSS, in this second administration, the NSS reflects Trump's true intentions.

The biggest distinction is the approach of the “Trump Corollary,” a complement to the isolationist 19th-century “Monroe Doctrine,” which demanded mutual nonintervention between Europe and the U.S. The corollary emphasizes border control and stability in the Western Hemisphere (North and South America), in order to protect against immigration and the influx of narcotics into the U.S.

Already, the Trump administration has detained a large number of immigrants [in the U.S. illegally] and deported them to South America. In the Caribbean Sea in Central America, Trump has attacked ships on suspicion that they are “drug boats.” Because the legality of these actions is questionable, he is probably using that reasoning as justification.

This new Monroe Doctrine that discourages concern for other regions and restricts allied relationships to the extent that they suit the needs of the U.S., is apparent at every turn in the NSS.

Dissatisfaction with allied nations “free-riding” on the U.S. for national security is obvious, with calls for allies to increase their defense spending and take responsibility for their own national security.

There is a distancing in the NSS from that of the administration of former President Joe Biden, which supported an “integrated deterrence” that emphasized cooperation with allies and promoted deterrence. A written expression of a value-oriented diplomacy of democracy versus despotism has also disappeared. It is difficult to understand the call to “reestablish strategic stability with Russia,” which continues its invasion of Ukraine.

Use of the evaluation criteria of benefit to U.S. economic security is also no exception in prioritizing U.S. interests. On the one hand, China is ranked as its largest competitor, but the U.S. justifies the strategic use of tariffs and imposes heavy tariffs on Japan and many other friendly allied nations.

Protectionism that favors one nation's own interests deepens international division and was a factor leading up to World War II. Trump and the U.S. citizens themselves should certainly prepare themselves for the heavy toll that the self-centered choices of a superpower will incur.


<社説>米国家安保戦略 新たな孤立主義を憂う

 2期目のトランプ政権が「国家安全保障戦略(NSS)」を公表した。「米国第一主義」をさらに先鋭化させた内容で、戦後の国際秩序を下支えしてきた協調体制との事実上の決別宣言には不安を禁じえない。
 米NSSは政権発足の都度まとめるもので、政権1期目のNSSには同盟重視という米国の伝統的な外交方針が残っていたが、2期目はトランプ大統領の本音が反映された。
 最大の特徴は、欧州と米大陸の相互不干渉を求めた19世紀の孤立主義「モンロー主義」を補完する「トランプ・コロラリー(帰結)」という考え方だ。米国への移民や麻薬の流入を防ぐために「西半球(南北アメリカ)」の国境管理と安定を最重視している。
 トランプ政権はすでに非正規滞在者を大量に拘束して南米などに送還。中米カリブ海では「麻薬運搬船」と疑った船舶を攻撃しており、国際法上の正当性が疑問視される振る舞いに、根拠を与える狙いがあるのだろう。
 ほかの地域への関与は抑え、同盟関係の維持も自国の利益にかなう範囲に限る新しいモンロー主義もNSSの随所に表れている。
 米国の安全保障に同盟国が「ただ乗り」しているなどの不満が目立ち、同盟国に対して防衛予算を増やし、自国の安全保障に責任を持つよう求めている。
 同盟国と協力して抑止力を高める「統合抑止力」を掲げたバイデン前政権のNSSを否定し、民主主義対専制主義という価値観外交の表記も消えた。ウクライナ侵攻を続けるロシアを「戦略的安定を再構築するべき相手」としていることも理解に苦しむ。
 米国の利益を判断基準とすることは経済安保も例外でない。中国を最大の競争相手と位置付ける一方、関税の戦略的な活用を正当化し、日本など友好・同盟国の多くにも高関税を課している。
 自国利益を優先する保護主義は国際的な分断を深め、第2次世界大戦につながった。超大国による自己中心的な選択が招く代償の重さを、トランプ氏はもちろん米国民自身も覚悟せねばなるまい。
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