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*.Research Service
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Russia's Invasion of Ukraine: Turkey's
Response and Black Sea Access Issues
March 11, 2022
Russia's early 2022 invasion of Ukraine has heightened challenges North Atlantic Treaty Organization
(NATO) ally Turkey faces in balancing relations between the two countries and managing Black Sea
access, with implications for U.S.-Turkey ties. In recent years, Turkey's links with Russia-especially its
2019 acquisition of a Russian S-400 surface-to-air defense system-have fueled major U.S.-Turkey
tensions, triggering sanctions and reported informal congressional holds on arms sales. Turkey's
increasing cooperation with Ukraine may have some alignment with U.S. interests in limiting Russia's
ability to reassert regional dominance. Turkey has made some efforts to mediate between Russia and
Ukraine in the current crisis. For additional context, see CRS Report R44000, Turkey: Background and
U.S. Relations In Brief, by Jim Zanotti and Clayton Thomas.
Assessing Turkey's Response
In its response to Russia's invasion, Turkey likely hopes to minimize spillover effects to its national
security and economy. While Turkey has denounced the invasion and supplied Ukraine with armed drone
aircraft and humanitarian assistance, the Turkish government has said Turkey will not join economic
sanctions against Russia. The conflict has already worsened Turkey's ongoing domestic currency and
inflation crisis, and its economy could be vulnerable to Russian cutoffs of natural gas and wheat exports
or military actions in Syria that create new refugee flows.
In late February, Turkey acknowledged a state of war between Russia and Ukraine, invoking Article 19 of
the 1936 Convention Regarding the Regime of the Straits (the Montreux Convention), which bars
belligerent countries' naval access to and from the Black Sea through the Bosphorus and Dardanelles
Straits (see Figure 1). A few days earlier, Ukraine had called for the Straits' closure. Shortly after
Turkey's decision, Secretary of State Antony Blinken expressed appreciation for Turkey's implementation
of the Convention and support for Ukraine. (The United States is not a party to the convention, but has
complied with its terms since it went into effect in 1936 as a treaty that is reflective of customary
international law.)
Congressional Research Service
https://crsreports.congress.gov
IN11885
CRS INSIGHT
Prepared for Members and
Committees of Congress

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