Fleet

Russia’s Baltic Fleet Successfully Attacked By Ukrainian Drones

The prestigious Russian Navy base at Kronstadt, near St. Petersburg, came under Ukrainian drone attack overnight, in what may well be the first strike of its kind against the Baltic Fleet. Ukrainian drones targeted the naval base, including the Project 20380 Steregushchiy class corvette Boikiy, highlighting the fact that Russian warships are vulnerable even when hundreds of miles from Ukraine’s borders.

According to the official account of the Ukrainian 414th Separate Unmanned Strike Aviation System Brigade on X, the corvette was set ablaze while in the Veleshchynskyi dry dock in Kronstadt, where it is said to have entered scheduled maintenance in February of this year. The same account posted a video showing the attack. While we are used to kamikaze drone video feeds cutting out just before detonation, the fact that multiple drones were involved means we can see the burning vessel from several angles.

Reportedly, the drones that hit the corvette were from the 1st Separate Center of Ukraine’s Unmanned Systems Forces. Considering the long distance to the target, it is interesting to note that video from the seekers was available. This indicates that either a local operator on the ground was involved in targeting and recording the feed, or otherwise a satcom link was used to do the same. While it is conceivable that the drones used autonomous guidance, they would still have needed someone nearby or connected via satcom to record the seeker’s view. Another possibility is that shorter-range drones were used for the attack, something that Ukraine has done before for attacks deep in Russia, although this seems less likely here.

A drone’s eye view of the Russian corvette Boikiy ablaze in the Veleshchynskyi dry dock in Kronstadt. Ukrainian Ministry of Defense screencap

Ukraine’s Unmanned Systems Forces stated that the Boikiy was involved in escorting ships associated with Russia’s so-called shadow fleet, the collection of older tankers operating under foreign flags that Moscow relies on to export oil despite Western sanctions. According to Ukrainian officials, Russia has increasingly tasked Baltic Fleet vessels with escort, monitoring, and security missions for these tankers as they transit the Baltic Sea carrying sanctioned Russian oil to markets prepared to bypass Western restrictions.

The Steregushchiy class ships are among Russia’s more modern corvettes. With a standard displacement of 1,800 tons, a length of 343 feet, and a flight deck for a helicopter, the corvettes are closer to frigates, according to some classification systems. Their primary armament consists of two quadruple launchers for Uran anti-ship missiles, a 12-cell Redut vertical launch system for various air defense missiles, and two quadruple tubes for Paket-NK anti-torpedo/anti-submarine torpedoes.

The British offshore patrol vessels HMS Mersey and HMS Severn shadow the Russian corvette Boikiy in the English Channel in 2017.

The attack on the naval base was part of a wider Ukrainian drone barrage directed against other military and energy sites in and around St. Petersburg early on Wednesday. Footage of the attacks showed drones, reportedly FP-1/2 types, low over the Gulf of Finland and in the skies above the city.

The attacks occurred just hours before international guests gathered for the city’s flagship economic forum. “The Petersburg forum is opening with a nice plume of black smoke in the background after Ukrainian strikes,” posted Serhiy Sternenko, an adviser to the Ukrainian defence minister.

Several long-range drones also crashed into oil storage facilities in St. Petersburg after Russian air defenses reportedly tried unsuccessfully to shoot them down. Loud explosions were heard, and black smoke could be seen rising from the blazing oil terminal, one of the largest on Russia’s Baltic Sea coast.

Russian authorities confirmed that the attacks had taken place, with St. Petersburg’s governor, Alexander Beglov, saying that the Kirovsky and Krasnoselsky districts had been targeted.

Ukrainian President Volodymyr Zelensky, writing on social media, said that drones had hit “important facilities on Russian territory,” including the St. Petersburg oil terminal, the Kronstadt base, and a weapons factory in the Tambov region.

“I thank our warriors for their precision. Ukraine’s plan for long-range sanctions is being implemented exactly as needed to bring peace closer,” Zelensky said.

The significance of the strikes is manifold.

First off, the drone strikes have a highly symbolic value, and will be especially embarrassing for the Kremlin, since they come immediately in advance of the three-day annual summit being held in St. Petersburg, and billed as Russia’s answer to Davos.

Guests arrived for today’s opening ceremony under a pall of thick smoke, and Russian President Vladimir Putin is due to make a keynote speech at the event on Friday. There was further disruption for arriving guests as St. Petersburg’s airport was temporarily closed.

Secondly, the drone strikes underscore Ukraine’s ability to strike targets deep within Russia, using a growing array of long-range one-way attack drones and cruise missiles. The targets are around 680 miles from the nearest Ukrainian border.

The approximate location of Kronstadt and St. Petersburg in relation to Ukraine. Google Earth

Finally, by targeting Kronstadt, the attacks also signify the opening up of a new front in the drone war, namely against the Baltic Fleet while it is in port.

Located on Kotlin Island in the Gulf of Finland, about 18 miles west of St. Petersburg, Kronstadt is one of the principal bases associated with the Baltic Fleet. Today, it primarily hosts corvettes and patrol vessels, naval support ships, training units, as well as repair and maintenance facilities. Since any naval threat approaching St. Petersburg from the Gulf of Finland must pass near Kronstadt, the base effectively acts as the maritime gateway to Russia’s second-largest city.

The approximate location of Kronstadt, at the gateway to St. Petersburg, and at the far east end of the Baltic. Google Earth

There have been very few confirmed Ukrainian attacks of any kind on the Baltic Fleet compared with the extensive campaign waged against Russia’s Black Sea Fleet.

In April 2024, there was a fire on a Russian warship at Baltiysk in Kaliningrad. The fire damaged communications and electronic systems aboard the Buyan class corvette Serpukhov. A Ukrainian military intelligence official subsequently claimed that this was the result of a covert joint operation conducted by his GUR agency and a pro-Kyiv Russian military group.

So far, of course, Ukraine’s naval campaign has focused overwhelmingly on the Russian Black Sea Fleet. Many successful attacks have been recorded against Black Sea Fleet vessels and facilities, forcing the general evacuation of Russian naval assets from occupied Crimea and to bases in Russia proper.

In recent months, Ukraine has waged an aerial campaign to disrupt Russia’s economy. Long-range drones have hit ports and oil storage facilities, military factories, and airbases. There has also been an uptick in attacks against tankers and trucks moving between occupied southern Ukraine and Crimea, leading to fuel shortages across the peninsula.

Meanwhile, the scale of Russian missile and drone attacks on Ukraine remains undiminished. On Monday, a barrage of Russian strikes killed 23 people across Ukraine and injured many more. This led Zelenskyy to renew his plea for the U.S. government to provide Kyiv with more Patriot missiles. Today, he said that “an agreement at the highest political level on the purchase of Patriot systems […] is awaiting implementation at the financial, legal, and technical levels.”

Whether or not the overnight strike caused significant damage, its strategic message was unmistakable. By reaching Kronstadt, one of Russia’s most historic naval bases, Ukraine demonstrated that even the Baltic Fleet is no longer beyond its reach. The attack highlights Kyiv’s growing long-range capabilities and signals that Russia’s efforts to protect both its regular fleet and its shadow oil-export network may face increasing pressure, even far from the front lines.

Contact the author: thomas@thewarzone.com

Thomas is a defense writer and editor with over 20 years of experience covering military aerospace topics and conflicts. He’s written a number of books, edited many more, and has contributed to many of the world’s leading aviation publications. Before joining The War Zone in 2020, he was the editor of AirForces Monthly.




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Tracking the shadow fleet: How Iran evaded the US naval blockade in Hormuz | Investigation

On March 11, the Thai cargo ship Mayuree Naree was struck by two projectiles while crossing the Strait of Hormuz, one of the world’s most important waterways located between Iran and Oman. A fire broke out in the engine room, and while 20 sailors were rescued, three remained trapped inside the stricken vessel. Their remains were found weeks later when a specialised rescue team boarded the vessel, which had run aground on the shores of Iran’s Qeshm island.

At about the same time, a “shadow fleet” of tankers continued to navigate the very same waters safely. Operating with fake flags, disabled signals and unspecified destinations, this covert armada survived because it operates outside the traditional rules of maritime trade.

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Iran threatened to block “enemy” ships passing through the Strait of Hormuz – a crucial chokepoint for a fifth of the world’s oil – in the wake of the United States-Israeli war launched on February 28. Soon, navigation through the strait was disrupted amid fears of attacks.

Following a temporary ceasefire on April 8, the United States imposed a full naval blockade on Iranian ports on April 13. Theoretically, traffic through the strait should have come to a complete halt.

However, tracking data reveals a remarkably different reality.

INTERACTIVE - Strait of Hormuz - March 2, 2026-1772714221
(Al Jazeera)

An exclusive Al Jazeera open-source investigation tracked 202 voyages made by 185 vessels through the strait between March 1 and April 15, navigating both under fire and across blockade lines.

The numbers behind the shadows

To understand how the strait operated under extreme pressure, Al Jazeera’s Digital Investigative Unit monitored the waterway daily, cross-referencing vessel International Maritime Organization (IMO) numbers with international sanction lists from the US Office of Foreign Assets Control (OFAC), the European Union, the United Kingdom and the United Nations. An IMO number is a unique seven-digit figure assigned to commercial ships.

Of the tracked voyages, 77 (38.5 percent) were directly or indirectly linked to Iran. Notably, 61 of the ships transiting the strait were explicitly listed on international sanctions lists.

INTERACTIVE-Vessel Traffic Through the Strait of Hormuz between March 1 and April 15-1777534474
(Al Jazeera)

The investigation divided the conflict into three distinct phases to map the fleet’s behaviour:

  • Phase 1: Open War (March 1 – April 6): 126 ships crossed the strait, peaking at 30 vessels on March 1. Among these, 46 were linked to Iran.
  • Phase 2: The Truce (April 7 – 13): 49 ships crossed during this fragile pause. More than 40 percent of these vessels were tied to Iran, including the US-sanctioned, Iranian-flagged Roshak, which successfully exited the Gulf.
  • Phase 3: The US Blockade (April 13 – 15): Despite the explicit naval blockade, 25 ships crossed the strait.

Breaking the blockade

When the US blockade took effect, the shadow fleet adapted immediately.

The Iranian cargo ship “13448” successfully broke the blockade. Because it is a smaller vessel operating in coastal waters, it lacks an official IMO number, allowing it to evade traditional sanction-monitoring tools. The vessel departed Iran’s Al Hamriya port and reached Karachi, Pakistan.

Similarly, the Panama-flagged Manali broke the blockade, crossing on April 14 and penetrating the cordon again on April 17 en route to Mumbai, India.

The investigation uncovered widespread manipulation of Automatic Identification System (AIS) trackers. Vessels such as the US-sanctioned Flora, Genoa and Skywave deliberately disabled or jammed their signals to hide their identities and destinations.

Fake flags and shell companies

To obscure ultimate ownership, the shadow fleet heavily relies on a complex web of “false flags” and shell companies. The investigation identified 16 ships operating under fake flags, including registries from landlocked nations like Botswana and San Marino, as well as others from Madagascar, Guinea, Haiti and Comoros.

INTERACTIVE- Strait of Hormuz AJA Vessel registry breakdown by flag state-1777534470
(Al Jazeera)
INTERACTIVE-Commercial managers behind vessels-1777534468
(Al Jazeera)

The operational network managing these ships spans the globe. Operating firms were primarily based in Iran (15.7 percent), China (13 percent), Greece (more than 11 percent) and the United Arab Emirates (9.7 percent). Notably, the operators of nearly 19 percent of the observed vessels remain unknown.

The toll of a parallel system

Despite the intense military pressure, energy carriers dominated the traffic, with 68 ships (36.2 percent) transporting crude oil, petroleum products and gas. Ten of these tankers were directly linked to Iran. Non-oil trade also persisted, with 57 bulk and general cargo ships crossing during the open war phase, 41 of which were tied to Tehran.

INTERACTIVE-Strait of Hormuz traffic by vessel type-1777534472
(Al Jazeera)

Before the war, at least 100 ships crossed the Strait of Hormuz daily. Today, a staggering 20,000 sailors are trapped on 2,000 ships across the Gulf – a crisis the International Maritime Organization described as unprecedented since World War II.

A shadow Iranian fleet, meanwhile, has been navigating seamlessly as part of a parallel maritime system born from 47 years of US sanctions on Tehran. Washington slapped sanctions on Tehran following the 1979 Islamic revolution that toppled the pro-Washington ruler Shah Mohammad Reza Pahlavi. The two countries have had no diplomatic ties since 1980.

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