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.
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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