KERCH STRAIT, November 2018 — The shift was unmistakable. When Russian coast guard vessels opened fire on and seized three Ukrainian navy ships attempting to transit from the Black Sea to the Sea of Azov through the Kerch Strait, it wasn’t just a maritime dispute. It was a demonstration of force, a signal of intent, and, as events would later prove, a dry run for a much larger war.
The ships in question were the tugboat Yany Kapu and two artillery boats, Berdyansk and Nikopol. Russia claimed they had illegally entered its territorial waters.
Ukraine countered that the vessels had the right of innocent passage under the 2003 treaty. Russia’s response was not diplomatic. It was kinetic.
Twenty-four Ukrainian sailors were captured and held for about 10 months. The incident drew immediate international condemnation.
The European Union and the United States imposed sanctions. The International Tribunal for the Law of the Sea ruled on May 25, 2019, that Russia must release the sailors and return the ships. Russia complied on September 7, 2019.
But the damage was done.
A Pattern of Escalation
What’s changing is the way we understand that November day. At the time, it was a serious but contained crisis. In hindsight, it reads as a precursor.
The Kerch Strait incident demonstrated Russia’s willingness to use force to assert control over the strait—a choke point connecting the Black Sea to the Sea of Azov, and a vital economic artery for Ukrainian ports like Mariupol. The trend underneath is one of calculated escalation.
The seizure of the Ukrainian ships and the prolonged detention of their crews did not trigger a wider war in 2018. But it tested the international response, revealed the limits of diplomatic and sanctions-based pushback, and set the stage for what came next.
The Precursor to Full-Scale War
On February 24, 2022, Russia launched its full-scale invasion of Ukraine. The Kerch Strait incident is now widely seen as an early warning sign—a moment when Russia showed it was prepared to use military force to redraw the rules of engagement in the region. The international community condemned, sanctioned, and ruled.
Russia released the sailors and ships. But the underlying dynamic did not change.
Watch this space. The Kerch Strait remains a flashpoint. Control of the strait gives Russia the ability to choke Ukrainian maritime access to the Sea of Azov, a strategic lever it has already proven willing to use.
The incident of November 2018 was not an anomaly. It was a signal.
The question now is whether the pattern it set—aggression, condemnation, sanctions, partial compliance, repeat—has been broken by the full-scale war, or whether it remains the template for what comes next.
