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U.S. Strike on Syrian Airbase: Legal under

International Law?



April 17, 2017
In his letter to Congress under the War Powers Resolution, President Trump cited his Article II powers as
his domestic legal authority for the April 6 missile strike on Al Shayrat airbase in Syria, but did not
describe a legal basis to justify the action under international law. The missile strike may raise questions
under international law including, in particular, whether the action is consistent with U.S. obligations
under the U.N. Charter. The answer may in turn raise questions about whether the validity of the
international legal basis has any bearing on the validity of the action pursuant to U.S. domestic law. This
Sidebar provides a brief overview.
Article 2(4) of the U.N. Charter prohibits the threat or use of force against the territorial integrity or
political independence of another Member state unless an exception exists. There are at least three sets
of circumstances that do - or may - constitute exceptions to this prohibition.
The first basis for an exception is U.N. Security Council authorization grounded in the powers granted to
it by Chapter VII of the U.N. Charter to respond to threats to international peace and security. That
Chapter authorizes the Security Council to determine the existence of any threat to the peace, breach of
the peace, or act of aggression and to make recommendations and take other actions to maintain or
restore international peace and security. Express authorization from the Security Council would provide
the clearest legal basis for military action in response to Syria's use of chemical weapons. However, while
the U.N. Security Council has adopted resolutions regarding the situation in Syria (e.g., U.N.S.C.
Resolution 2118, issued in 2013) that include language condemning the use of chemical weapons as a
breach of international law and a threat to international peace and security, the Security Council has
stopped short of authorizing the use of military force to enforce the prohibition.
The second basis for an exception to Article 2(4) limitations on the use of force is when such action is
taken in self-defense. Article 51 of the Charter explicitly recognizes the right of self-defense as an
exception to Article 2(4)'s prohibition. Specifically, Article 51 states, Nothing in the present Charter
shall impair the inherent right of individual or collective self-defense if an armed attack occurs against a
Member of the United Nations .... There has been no claim that Syria has conducted an armed attack
against another nation. However, some theorists and practitioners, consider that there also exists a
customary doctrine of inherent self-defense outside of the circumstances identified by Article 51. This
doctrine would permit military action to counter a grave threat to regional peace and stability, even if that

                                                                   Congressional Research Service
                                                                   https://crsreports.congress.gov
                                                                                        LSB10230

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