Ukrainian Navy Strikes Two Russian Patrol Boats Guarding Kerch Bridge

Key facts

• Ukrainian Navy struck Russian FSB patrol boat Sobol and anti-sabotage boat Grachonok on night of April 29-30.
• The strike occurred in the Kerch Strait area, where the boats were guarding the Kerch Bridge.
• Russian forces suffered both irreversible and sanitary losses, according to the Ukrainian Navy.
• On April 29, Ukrainian Navy struck the sanctioned tanker Marquise near Tuapse, damaging its stern.
• In early April, Ukraine's HUR destroyed the Slavyanin, Russia's last railway ferry in the Kerch Strait.
• Ukraine's Unmanned Systems Forces struck two Russian helicopters (Mi-28 and Mi-17) in Voronezh region.

Night Strike on Kerch Strait Patrol Boats

Ukraine’s Navy struck two Russian patrol boats guarding the Kerch Bridge in the Kerch Strait on the night of April 29-30. The attack hit the Russian Federal Security Service (FSB) patrol boat Sobol and the anti-sabotage vessel Grachonok, both key assets used to protect the bridge and counter sabotage operations. The Ukrainian Navy announced the operation on Facebook and Telegram, stating that “forces and means of the Ukrainian Navy inflicted damage on the Russian naval fleet in the Kerch Strait area.” A short video released by the Navy appears to show the moment of the strike from naval drones, though the time and location could not be independently verified. “As a result of the strike, the enemy suffered irrecoverable and sanitary losses,” the Navy said, without specifying exact numbers.

The Targeted Vessels: Sobol and Grachonok

The Sobol is a patrol boat of the FSB Border Service’s Coast Guard, while the Grachonok is an anti-sabotage boat used by the Russian Navy. Both vessels are integral to securing the Kerch Bridge, which connects mainland Russia to occupied Crimea, and are tasked with countering sabotage and drone attacks. The Ukrainian Navy described them as “key units of the Coast Guard of the Border Service of FSB and the Russian Navy.” Their destruction or disablement reduces Russia’s ability to defend the strategically vital bridge, which has been a frequent target of Ukrainian attacks.

Escalating Naval Campaign in the Black Sea

The strike is part of a broader Ukrainian campaign to degrade Russia’s naval presence in the Black Sea. On April 29, a day earlier, a Ukrainian Navy unit struck the sanctioned tanker Marquise near Tuapse on Russia’s Black Sea coast. The Cameroon-flagged vessel, with a capacity of over 37,000 tons, was drifting without cargo about 210 km from Tuapse with its Automatic Identification System turned off, likely awaiting a ship-to-ship transfer. The strike hit the stern, causing an explosion in the propeller and engine room area; damage is still being assessed. In early April, Ukraine’s military intelligence agency (HUR) reported that its special forces had destroyed the Slavyanin, Russia’s last railway ferry in the Kerch Strait. The vessel was part of Russia’s Kerch ferry crossing, used to supply troops in occupied Crimea, including transporting fuel, weapons, ammunition, and military equipment.

Previous Strikes and Systematic Reduction of Russian Capabilities

The Ukrainian Navy stated that this strike is “another example of the effective work of the Ukrainian Navy and the consistent reduction of the enemy’s capabilities in the Black Sea.” On April 21 and the night of April 21-22, Ukraine’s defence forces carried out strikes against a Russian naval vessel traffic centre for the Black Sea Fleet and other Russian assets. Prior to that, the analysis of operations by the Security Service of Ukraine’s Special Operations Centre Alpha (April 17-18) and Defence Intelligence of Ukraine’s special unit Prymary (April 18-19) in Sevastopol Bay confirmed strikes on five ships belonging to Russia’s Black Sea Fleet.

Broader Context: Kerch Bridge as a Strategic Target

The Kerch Bridge, opened by Russia in 2018, is a critical logistics link for Russian forces in occupied Crimea and southern Ukraine. It has been repeatedly targeted by Ukrainian forces using drones and missiles. The destruction of patrol boats and ferries that guard or supply the bridge undermines Russia’s ability to sustain its military operations in the region. The Ukrainian Navy’s statement emphasized that the boats struck were “used to guard the Kerch Bridge and counter sabotage operations.” By neutralizing these vessels, Ukraine aims to create vulnerabilities in the bridge’s defense, potentially setting the stage for future strikes on the bridge itself.

Outlook: Continued Pressure on Russian Naval Assets

The recent strikes indicate a sustained Ukrainian effort to erode Russia’s naval power in the Black Sea, particularly assets that protect the Kerch Bridge. The use of naval drones has become a hallmark of Ukrainian tactics, allowing precision strikes against high-value targets. As Ukraine continues to develop its unmanned systems and coordinate strikes across multiple domains, Russia’s ability to secure its maritime infrastructure and supply lines faces increasing challenges. The cumulative effect of these operations may force Russia to divert resources to protect its remaining assets, further straining its military logistics.

The bottom line

• Ukraine’s Navy struck two Russian patrol boats (Sobol and Grachonok) guarding the Kerch Bridge on the night of April 29-30.
• The strike caused Russian casualties and is part of a systematic campaign to degrade Russia’s Black Sea capabilities.
• On April 29, Ukraine hit the tanker Marquise near Tuapse, and in early April destroyed the railway ferry Slavyanin.
• Ukraine’s Unmanned Systems Forces also struck two Russian helicopters in Voronezh region on April 30.
• The Kerch Bridge remains a key strategic target, and Ukraine is methodically reducing its defenses.
• Ukrainian naval drones have proven effective in striking high-value Russian assets, signaling a shift in naval warfare tactics.