A senior Ukrainian military officer with deep ties to the country’s intelligence services played a central role in the bombing of the Nord Stream natural gas pipelines last year, according to officials in Ukraine and elsewhere in Europe, as well as other people knowledgeable about the details of the covert operation.

The officer’s role provides the most direct evidence to date tying Ukraine’s military and security leadership to a controversial act of sabotage that has spawned multiple criminal investigations and that U.S. and Western officials have called a dangerous attack on Europe’s energy infrastructure.

Roman Chervinsky, a decorated 48-year-old colonel who served in Ukraine’s special operations forces, was the “coordinator” of the Nord Stream operation, people familiar with his role said, managing logistics and support for a six-person team that rented a sailboat under false identities and used deep-sea diving equipment to place explosive charges on the gas pipelines. On Sept. 26, 2022, three explosions caused massive leaks on the Nord Stream 1 and 2 pipelines, which run from Russia to Germany under the Baltic Sea. The attack left only one of the four gas links in the network intact as winter approached.