A 50-year-old Ukrainian national. Identified by German media as Serhii K., has been charged in Germany in connection with the 2022 Nord Stream pipeline explosions, according to German media reports. K. was detained in Italy on a German arrest warrant in August 2025 and extradited to Germany. He is accused of leading a team of seven accomplices in the operation that destroyed three of the four Nord Stream gas pipelines in the Baltic Sea.

Accusations and Legal Proceedings

K. is also accused of attacking civilian energy infrastructure, which is considered a war crime under international law, according to reports from Süddeutsche Zeitung and Zeit. He has denied involvement in the attacks, and his lawyer told Reuters that he was confident his client would be acquitted. The evidence against K. is reportedly considered to be overwhelming, including traces of the military explosives HMX and RDX found on the sailing yacht Andromeda, from which the attack was allegedly carried out.

According to reports. K. is alleged to have incriminated himself in intercepted phone calls made while in custody in Italy pending extradition — One of K.’s seven alleged accomplices has reportedly since been killed during Russia’s ongoing war in Ukraine. K. was arrested on August 21, 2025, in the Italian province of Rimini. Following his transfer to Germany on November 27, 2025, a German judge executed the arrest warrant the next day, and he has been in pre-trial detention in the northern city of Hamburg since.

Context and Evidence

German media reported that the Nord Stream pipelines transported Russian gas to Europe but were not in use at the time of the explosions; the blasts occurred in September 2022 and were a significant event in the context of German-Russian energy cooperation. According to T-Online. The Royal Danish Navy patrol boat ‘Nymfen’ unexpectedly left Rødbyhavn at 7:50 p.m. on September 21, 2022, and set course for the area that would later become known as the scene of the Nord Stream sabotage. The patrol boat was soon joined by Swedish military forces by sea and air, according to T-Online.

The course of one of the Swedish pursuers in the coming days was toward the Russian exclave of Kaliningrad at the Baltic Sea, according to T-Online. This suggests that the patrol boats were likely chasing Russian military vessels. T-Online also reported that the Russian Navy is believed to have operated a mini-submarine at the Nord Stream sites days before the explosions. This information calls into question previous theories about the source of the sabotage.

Investigation and International Reactions

German media reported that the Nord Stream sabotage occurred at a depth of nearly 80 meters, with the exact location of the pipelines known only to insiders. For many years, the area northeast of the Danish island of Bornholm was nothing more than a random spot in the Baltic Sea, located just outside the Danish and Swedish radar zones. According to T-Online, Danish patrol boats rarely patrolled this area, and when a Swedish radar aircraft took off from Malmen military airfield at about the same time every morning to fly over the Baltic Sea, the crew tended to secure the strategically important island of Gotland.

The explosions on September 26, 2022, marked the abrupt end of a very exclusive German-Russian energy cooperation. The area northeast of Bornholm, which had previously been of little strategic importance, became a focal point for military activity. The events leading up to the explosions suggest that there was an urgent need for inspection, as indicated by the unexpected departure of the Danish patrol boat ‘Nymfen’ and the subsequent military response from Sweden.

According to T-Online, the investigation into the Nord Stream explosions has revealed new details that challenge previous theories. The presence of a Russian mini-submarine at the site days before the explosions raises questions about the involvement of Russian forces. This development adds a new layer of complexity to the ongoing investigation into the sabotage of the Nord Stream pipelines.