A senior Ukrainian military officer with intelligence ties coordinated the sabotage attack on the Nord Stream gas pipelines last year, The Washington Post and Der Spiegelreported Saturday, citing anonymous Ukrainian and European officials, as well as other people familiar with the operation.Moscow and Kyivs Western allies have traded blame over the subsea blasts that ruptured Nord Streams 1 and 2 gas arteries between Russia and Europe via the Baltic Sea seven months into Russias invasion of Ukraine.The officers role provides the most direct evidence to date tying Ukraines military and security leadership to the mysterious September 2022 attack, The Washington Post said.Colonel Roman Chervinsky, 48, who served in Ukraines Special Operations Forces, was the coordinator of the Nord Stream operation, The Washington Post cited individuals with knowledge of his role as saying.Chervinsky was reported to have managed logistics and support for a team of six people that rented a sailboat under false identities and used deep-sea diving equipment to place explosive charges on the gas pipelines.According to The Washington Post, Chervinsky took orders from more senior Ukrainian officials who themselves reported to General Valery Zaluzhny, the head of the Ukrainian military.Chervinsky denied having any role through his lawyer,and spokespeople for the Ukrainian government did not respond to questions about Chervinskys participation.The New York Times reported in March that United States officials had seen intelligence indicating that a "pro-Ukrainian group" was responsible for the sabotage.Ukraine has denied a role in the Nord Stream attack.The incident severely damaged Russia's ability to sell natural gas to Western Europe a source of income for its war chest and fueled a surge in energy prices on the continent.Nord Stream 1 had accounted for 40% of the European Unions gas supplies via Germany, keeping energy costs low in the EUs largest economy.With a capacity of carrying 170 million cubic meters of gas per day, Russia had cut flows to 20% before halting the pipeline's operations altogether.Nord Stream 2 was due to double export capacities to 110 billion cubic meters, but the project never received authorization due to Russias recognition of Ukraine's separatist regions as independent states ahead of Moscow's full-scale invasion.Denmark, Germany and Sweden are conducting investigations into the Nord Stream sabotage.