What legal justifications do states use for naval strikes on vessels near South America?

Checked on November 25, 2025
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Executive summary

States mounting naval strikes near South America have publicly invoked self‑defense, Article II commander‑in‑chief powers, and the notion of an “armed conflict” with cartels as legal bases; U.S. officials have told Congress the strikes are justified as defensive actions against narcotraffickers and have used classified DOJ opinions to shield personnel, while critics — including U.N. officials and independent experts — call those rationales insufficient or unlawful [1] [2] [3] [4]. Coverage is substantial but contested: administration claims of self‑defense and armed conflict are documented, yet multiple outlets report that full legal reasoning and publicly disclosed evidence remain limited [5] [1] [6].

1. The administration’s core legal claims: self‑defense and Article II authority

U.S. officials have framed strikes as acts of self‑defense against transnational drug groups and have relied on presidential Article II powers as commander‑in‑chief to authorize lethal force, arguing the cartels’ activities constitute an “armed attack” or immediate threat to the United States [2] [1]. Public notices to Congress and statements by administration figures describe the cartels as “unlawful combatants” or “non‑state armed groups,” and assert that military force is justified to stop a flow of lethal drugs and save American lives [1] [7].

2. Legal memos and classified reasoning: a closed box that shields personnel

Reporting shows a classified Justice Department Office of Legal Counsel (OLC) opinion and other internal memoranda underpin the policy, asserting that U.S. personnel conducting strikes would not face future prosecution; these documents are reportedly not fully public, limiting outside legal scrutiny [3] [2]. FactCheck.org and NPR note the administration has not provided many public details of the legal justification, leaving questions about the precise legal thresholds applied [5] [2].

3. Claims of “armed conflict” and designation language

The administration has informed Congress that the United States is engaged in an “armed conflict” with Latin American cartels and has used labels like “narcoterrorists” or “terrorist groups” when describing targets — language intended to align the campaign with wartime legal frameworks that permit use of lethal force against organized armed groups [8] [1]. Reuters and The Guardian report U.S. materials characterize cartels as having paramilitary capabilities and causing significant loss of life, points the administration uses to justify military measures [1] [6].

4. Domestic statutes and traditional maritime enforcement vs. strikes

Observers note established tools such as the Maritime Drug Law Enforcement Act give the U.S. authority to interdict vessels and arrest traffickers at sea, and historically the pattern has been boarding, seizure, and prosecution rather than remote lethal strikes — a contrast that raises legal and procedural questions about the current approach [9]. Legal commentators and some members of Congress argue the administration’s lethal approach departs from prior norms and lacks the investigative and judicial steps normally tied to maritime law enforcement [10] [9].

5. International law objections and human‑rights warnings

Independent UN experts and human‑rights officials have declared the strikes potentially violative of international human‑rights law and the law of the sea, calling some attacks “extrajudicial executions” if allegations of drug carriage are not proven and if lethal force was not the only option [6] [4]. The Guardian and AP cite UN and other international criticism that the use of lethal force in international waters needs a proper legal basis and proportionality assessment, which critics say has not been publicly demonstrated [6] [4].

6. Evidence gap: administration assertions vs. public proof

Multiple outlets emphasize a disconnect between governmental assertions that targeted vessels were carrying drugs or linked to cartels and the public presentation of corroborating evidence; reporters and some lawmakers say the White House and Pentagon have not provided a full factual record to justify lethal strikes rather than interdiction and arrest [5] [10] [11]. This evidentiary shortfall is central to both domestic legal debate and international criticism [5] [10].

7. Congressional and expert debate over scope of presidential power

Lawmakers from both parties have queried whether the president exceeded war powers or failed to consult Congress meaningfully; some senators have said there was “no legitimate legal justification” publicly provided, while legal scholars differ on whether the executive’s framings meet long‑standing international and U.S. legal tests for self‑defense or armed conflict [7] [12]. Georgetown commentary and other analyses report many legal experts view the strikes as unlawful or extrajudicial, though administration lawyers argue the opposite and rely on classified opinions [12] [3].

8. Bottom line and limits of current reporting

Available reporting shows the principal justifications advanced are self‑defense under Article 51 (as invoked publicly in UN‑context statements), Article II presidential authority, and treatment of cartels as armed groups — supported internally by classified DOJ memos — but independent verification of the underlying facts and full published legal reasoning is lacking, and international bodies and rights experts have explicitly challenged the legality of the strikes [6] [2] [3]. Available sources do not mention a fully transparent, public legal memorandum or declassified evidentiary dossier that justifies each strike in international law terms [5] [10].

Want to dive deeper?
What international laws govern interdiction and use of force at sea near South America?
How do coastal state rights under UNCLOS affect naval strikes on nearby vessels?
When can a state invoke self-defense or hot pursuit to justify attacking a ship?
What regional agreements in the Western Hemisphere regulate maritime enforcement and use of force?
How have recent incidents near South America been legally justified by claimant states?