Montreux Convention (1936)
mechanismNations & Geopolitics
A 1936 treaty hands one country total control over a chokepoint that could constrain a US war in two oceans at once.
Who they are
The Montreux Convention (1936), the treaty governing warship and civilian passage through Turkey's Bosphorus and Dardanelles straits[1].
What they do
The engine treats it as a hinge variable that gives Turkey decisive control over a critical maritime chokepoint.
How it works
In peacetime it allows unrestricted civilian passage but limits non-riparian warships (21-day maximum) and bars aircraft carriers; in wartime, or if Turkey feels threatened (Article 21), Turkey gets total unilateral discretion over transit with no higher authority able to overrule it, and the treaty never even defines what counts as a 'state of war,' leaving it to Ankara's political judgment. A proposed Kanal Istanbul would bypass Montreux entirely.
Why it matters
It matters because Turkey's control here could constrain US ability to project force across two theaters at once — a live pressure point in scenarios like a Taiwan conflict.
The engine's record — word for word
Governs Turkish Straits transit. Peacetime: unrestricted civilian passage, warship tonnage/duration limits for non-riparian states (21 days max). Aircraft carriers barred. Wartime: if Turkey is belligerent or threatened (Article 21), total unilateral discretion over transit. No higher authority can overrule. Treaty fails to define state of war — invocation entirely subject to Ankaras political interpretation. Kanal Istanbul would bypass Montreux entirely. [merged duplicate node] 1936 treaty gives Turkey Bosphorus/Dardanelles control. Can restrict warship transit in wartime. Hinge variable in Taiwan overextension: constrains US two-theater force projection.
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