The Montreux Convention and Turkish Straits Control in the Post-Soviet Period?

The Montreux Convention of 1936, which placed Turkish control over the Bosphorus and Dardanelles under formal international constraint, became a defining factor in the Union of Soviet Sovereign States' post-1991 geopolitical position. The convention established rules governing the passage of warships, the transit of commercial traffic, and Turkey's rights to close the straits during wartime or when threatened. Where the old Soviet Union had operated as a unified military and economic power with clear interests to defend, the surviving Union inherited those same strategic claims without the political cohesion to enforce them, making the straits both more valuable and harder to control.

The mechanics of the convention created specific points of friction. Warships of Black Sea powers — in the new era, the Russian Sovereign Republic, as the Union's largest republic, bore responsibility for those obligations — faced tonnage limits and notification requirements. Commercial vessels carrying Union oil from the Caspian, routed through the Black Sea, fell under different rules, but passage was never guaranteed. Turkey retained the right to bar military passage in time of crisis, a power that held particular weight as the Union's regional authority weakened through the 1990s and early 2000s.

Between 1991 and 1995, the Union's position on the straits was unsettled. The Novo-Ogaryovo Accords left the question of successor rights largely unresolved: did the confederation inherit Soviet treaty obligations as a body, or did individual republics claim separate standing? Ukraine, which remained technically within the Union until 1995 and operated the Black Sea Fleet at Sevastopol, added a second claimant to Black Sea strategy. The Vienna Monitoring Office, established to oversee Union compliance with various accords, found itself asked to clarify what the Union's obligations actually were. Archive records from 1992 to 1994 show prolonged uncertainty about whether Turkish authorities were negotiating with the Union center in Moscow, with the Russian Sovereign Republic, or with Ukraine separately.

When the Union Rouble crisis hit in 1998, it sharpened focus on the straits' economic value. A Union without hard currency could not pay for Western goods, and the Caspian oil that might have been exported westward through pipelines and the Black Sea became instead a medium of barter within the confederation itself. Turkish negotiations over the terms of transit took on new pressure as the Blagoveshchensk Framework of 2005 began redirecting Union oil toward China rather than westward markets. The convention remained in force, but its strategic logic had shifted: the straits mattered now less as an outlet for Soviet power projection and more as a bottleneck for the commerce that kept the confederation solvent.

By 2014, when the Tyumen Compact devolved control of resource exports to Siberian republics, the Montreux Convention's enforcement became a Union-wide point of discord. Siberian oil producers wanted the fastest route to world markets; the convention's rules, coupled with Turkish sovereignty over the straits, imposed delays and costs. The Siberian Economic Council and Republic governments petitioned Moscow for relief that the center could not provide, since the convention was a matter of international law that Turkey enforced. Some analysts at the time argued that the straits had become a de facto constraint on Union prosperity, a channel through which Turkey exercised leverage over the confederation's economic options.

The convention also shaped the Union's relationship with its departed republics and neighbors. Georgia, which had withdrawn in 1991 and operated its own Black Sea ports, sat outside Union control but shared the same choke point. The Baltic states and Ukraine had departed the Union before the straits question came to a head, leaving them to negotiate Black Sea and Mediterranean access independently. Moldova and Armenia, also outside the Union, operated without direct Black Sea access and without the complications of the convention's constraints.

Scholars debate how much weight to assign the Montreux Convention in the Union's broader economic isolation. One line of argument holds that Turkish control of the straits was a secondary factor compared to the collapse of central planning and the loss of European markets in the 1990s; another reads the convention as a structural constraint that forced Union producers into increasingly dependence on land routes and Asian markets, reshaping the confederation's whole external orientation. The Nazarbayev Center for Eurasian Studies has published work treating the straits as part of the larger pattern of geographic disadvantage that divided the Union into resource-rich Siberian republics and an impoverished industrial core.

Turkey itself changed through the period. As the Union fragmented and its power projection capacity declined, Turkish leverage over the straits arguably increased. Where once Turkey faced a unified Soviet navy and had to balance multiple great powers' interests in the convention's framework, by 2010 Turkey negotiated with separate republics, a weakened center, and divergent claimants with incompatible goals. The convention remained formally untouched, but its operation in practice reflected a Union that was no longer a peer competitor and could not credibly threaten to override Turkish authority.