German federal prosecutors have formally charged a 50-year-old Ukrainian national with masterminding the September 2022 underwater explosions that destroyed the Nord Stream gas pipelines in the Baltic Sea — the most significant act of infrastructure sabotage since the end of the Cold War. The suspect, identified in court documents under German privacy rules only as Serhii K., and confirmed by prosecutors as Serhii Kuznietsov, is accused of attacking civilian energy infrastructure, causing explosions, and destroying critical structures. It marks the first time anyone has faced formal charges over an attack that sent shockwaves through global energy markets and European security.
Prosecutors allege that Kuznietsov served as the on-board coordinator and team leader of a seven-person operation that used a sailing yacht, the Andromeda, chartered under forged identity documents and departing from the German port city of Rostock. The team — comprising four specialist divers, an explosives expert, and a skipper — allegedly placed highly explosive devices, made from a mixture of RDX and HMX, approximately 80 metres below the surface near Denmark's Bornholm Island. On 26 September 2022, three of the four pipeline sections ruptured, releasing record-breaking amounts of methane into the Baltic Sea and rendering the multi-billion-euro infrastructure inoperable. Investigators linked the yacht to the attack after finding fingerprints, hair samples, explosive residues, and other forensic evidence aboard. A traffic camera photograph on the island of Rügen, taken in early September 2022, eventually helped identify the full alleged cell of seven Ukrainians.
Significantly, German prosecutors are framing the charges not as conventional sabotage but as a war crime, arguing that the pipelines — civilian energy infrastructure — constituted a protected target under international criminal law, and that the operation was part of the broader war between Russia and Ukraine. Germany's Federal Court of Justice had already stated in December 2025 that the explosions were "with high probability" ordered by a foreign state as part of an intelligence operation, with investigators pointing to Ukrainian state agencies. Kuznietsov, who reportedly worked for Ukraine's SBU intelligence service until about eleven years ago and held a Ukrainian military ID at the time of the attack, has consistently denied any involvement, claiming he was in Ukraine on duty when the explosions occurred. His defence team has argued this would grant him functional immunity under international law.
A second Ukrainian suspect, aged 46, has been held in pre-trial detention in Poland since 2025, though a Warsaw court denied extradition to Germany, ruling that the attack could be viewed as a military action within the context of war and questioning German jurisdiction since the explosions occurred in international waters. Asked about the charges at a press conference in Dublin on Wednesday, Ukrainian President Volodymyr Zelenskyy declined to comment in detail, saying he had not yet officially received the full particulars of the indictment. Ukraine's government has consistently denied any involvement in or prior knowledge of the attack.
The case carries weighty diplomatic and financial implications. Nord Stream 1 had supplied Russian gas along a 1,200-kilometre route across the Baltic to north-eastern Germany, while Nord Stream 2 — fully owned by Russian gas giant Gazprom — was cancelled by Berlin shortly before Russia's full-scale invasion of Ukraine in February 2022 and never entered service. Russia has signalled it may seek compensation, with estimates of the pipeline's value ranging between €140 billion and €170 billion. The charges against Kuznietsov mark a rare judicial reckoning with an attack that for years generated competing theories of responsibility, including speculation about Russian operatives and even US Navy divers — theories that the forensic trail has not supported.