PKB Petrobalt does not build ships, it designs them — and that has arguably kept the Saint Petersburg bureau off the radar of Western sanctions for years. A widening EU review into Russia's civilian-vessel surveillance risk is starting to change that.
Sanctions regimes are built to target the visible parts of a supply chain: the shipyard that welds the hull, the operator that flies the flag, the bank that clears the payment. What they are structurally worse at catching is the layer underneath all of that — the engineering office that draws up the plans before a single plate of steel is cut.
That gap is now the subject of a widening European Union review, which has identified PKB Petrobalt — a Saint Petersburg-based maritime design bureau — as a significant, and until recently under-scrutinised, contributor to Russia's so-called shadow fleet, according to a detailed account of the investigation.
Petrobalt does not build vessels. It produces the technical plans, engineering specifications and naval architecture that shipyards then use to construct them. That distinction matters for sanctions purposes: enforcement regimes have historically been built around operators, flag registries and the physical yards doing the welding, not the design houses several steps removed from the finished ship. According to the New Statesman investigation, that positioning may have allowed Petrobalt to attract markedly less attention than the state shipbuilding groups and vessel operators it has worked alongside, including United Shipbuilding Corporation and fellow design bureaux such as Malakhit, Lazurit, Almaz and Severnoye PKB.
A sanctions regime built to catch the shipyard and the operator has a structural blind spot for the office that drew the plans.
The bureau's profile rose sharply, both reports note, after a September 2025 incident involving the Russian fishing vessel Mekhanik Stepanov — a ship built to a Petrobalt design. The vessel reportedly drifted near the southern entrance of the Øresund, the strait linking the North Sea and the Baltic and a route that carries a significant share of Northern Europe's seaborne energy and cable infrastructure, after apparent mechanical difficulties. Swedish coastguard vessels, Danish naval forces and a NATO asset are reported to have tracked the ship while it lingered near the strait.
The vessel's ownership links to Norebo, one of Russia's largest fishing conglomerates, which European authorities have separately been examining over concerns that commercial fishing fleets could double as intelligence-gathering assets in Northern European waters — part of the broader pattern Western officials and NATO have described publicly as Russia's use of ostensibly civilian shipping to probe or monitor undersea cables, pipelines and other critical infrastructure since at least 2023. What received comparatively little attention at the time, both outlets argue, was the role of the firm that had designed the ship in the first place.
Petrobalt's ties to Russia's state and security apparatus reportedly predate the current shadow-fleet concerns by years. Per the New Statesman's reporting, the bureau designed the Project 22120 Purga-class patrol vessels operated by Russia's Federal Security Service (FSB) — ice-capable ships used along the Northern Sea Route for border protection, fisheries enforcement and maritime security duties in Russia's Arctic and Far Eastern regions. The bureau's client list is also reported to extend into Arctic logistics and Gazprom-linked maritime programmes.
The recurring theme in both reports is that the formal civilian classification of many of these vessels sits awkwardly against Western officials' increasing difficulty in distinguishing Russia's commercial and strategic maritime assets. Murman Seafood, a Russian fishing operator sanctioned by the EU in 2025 over alleged links to maritime monitoring activity, is reported to operate Petrobalt-designed vessels. The bureau has also reportedly worked with Ascon, a Russian engineering-software developer already under US and EU sanctions, and with EKO Shipping, an Arctic transport operator sanctioned by both the UK and US.
Perhaps the most striking thread in the New Statesman's account concerns Petrobalt's ownership. In March 2022 — weeks after Russia's full-scale invasion of Ukraine — Alliance Group, a Moscow-based consulting and project-management firm controlled by businessman Vitaly Keondzhyan, is reported to have acquired a 15 per cent stake in the design bureau — a transaction that appears alongside a wider set of contract documentation circulating online detailing Alliance's business dealings.
That reported stake connects Petrobalt to a considerably broader industrial network. Alliance Group's other reported involvements span the Sukhoi Superjet programme, Russia's flagship civil aircraft project, where Keondzhyan is said to have sat on the board of Sukhoi Civil Aircraft, as well as helicopter programmes including the AW139 and VRT-500, and projects touching Russia's aviation, shipbuilding and nuclear research institutions. Alliance's leadership — Keondzhyan alongside long-serving deputy director Vladimir Zotov — is reported to run a network with footholds beyond Russia, including in Serbia, Montenegro and Cyprus, jurisdictions that have each drawn separate scrutiny in Western sanctions-evasion investigations in recent years.
For a business and City audience, the significance here goes beyond the geopolitics. Marine war-risk underwriters, P&I clubs and cargo insurers price risk based on where a vessel operates and who is presumed to control it — but a sanctions-relevant design bureau sitting invisibly upstream of a vessel's registration paperwork is precisely the kind of exposure standard know-your-counterparty screening is not built to catch. If EU or allied sanctions authorities do move against Petrobalt or its ownership network, any insurer, charterer or financier with exposure to vessels built on its designs — however many steps removed — could face fresh due-diligence and compliance questions with very little warning.
That is a live issue well beyond Russian waters. City firms have already had to reckon with how quickly compliance teams are being pushed toward more automated, real-time screening as sanctions lists and ownership structures shift faster than manual review can track — and a design bureau with reported links to FSB patrol vessels, a sanctioned software supplier and an opaque Cyprus-linked holding structure is exactly the kind of counterparty that automated screening is meant to surface before a relationship, not after a headline.
Neither the New Statesman nor UnHerd report a final sanctions determination against Petrobalt itself — the EU review is described as ongoing rather than concluded. But the direction of travel in Brussels has been toward closing exactly this kind of gap. As recently as mid-June 2026, the bloc added further individuals and entities to its Russia sanctions list, part of a pattern in which recent EU packages have progressively reached further up the supply chain — from operators and flag registries toward the technical and financial services that make those operators possible in the first place.
If that pattern holds, a quiet Saint Petersburg engineering office that has spent three decades drawing hulls for Arctic patrol boats and fishing trawlers may be about to become considerably less quiet.
