A Ukrainian former military officer has gone on trial in Germany, accused of organizing the 2022 sabotage of the Nord Stream gas pipelines. The trial, which commenced on Wednesday at the Hamburg Higher Regional Court, is the first public hearing concerning the investigation into the incident and is slated to continue into February.

The defendant, identified only as Serhii K. under German privacy laws, is a 50-year-old man alleged by prosecutors to have led a group of Ukrainian agents in the operation. This act is considered one of the most significant infrastructure sabotage events in recent history, which severed Western Europe's access to a major source of Russian natural gas.

Prosecutors contend that Serhii K. worked with other military personnel, on behalf of unidentified Ukrainian state entities, to plan and execute the attack. He was arrested in Italy in August 2025 and subsequently extradited to Germany. German authorities allege he entered Germany using a forged Ukrainian passport approximately three weeks prior to the explosions.

The group is accused of hiring a sailboat in Rostock and using it to reach a location near the Danish island of Bornholm. There, they allegedly attached military-grade explosives with timers to the pipelines on the seabed. German prosecutors consider the destruction of civilian infrastructure in this manner to be a war crime.

On September 26, 2022, Swedish seismologists recorded multiple underwater blasts, occurring hours apart. The sabotage resulted in the rupture of three of the four Nord Stream pipelines, releasing significant quantities of methane into the atmosphere. Nord Stream 1 was a primary supplier of natural gas to Germany, while Nord Stream 2, though constructed, never became operational after Germany halted its approval process before Russia's full-scale invasion of Ukraine.

Both Russia and the Ukrainian government have denied any involvement in the explosions. Moscow had already reduced gas supplies to Europe in response to sanctions, while Ukraine has consistently refuted accusations of its participation in the pipeline sabotage.

Serhii K. has pleaded not guilty to the charges. He is the sole individual on trial in this case, as the investigation continues to explore the identities and roles of other potential participants and the entities that may have commissioned the operation.

The trial is expected to scrutinize evidence gathered over several years and could potentially influence Germany's political relations with Ukraine, particularly given the ongoing conflict and the strategic importance of energy infrastructure.