Ukraine's government has denied a Wall Street Journal report this week that Kyiv approved the plan to blow up the Russian-owned Nord Stream pipelines in 2022. According to the newspaper, a crew of Ukrainian civilians and active-duty soldiers used a rented yacht to reach the pipelines, which deliver Russian natural gas to Germany via the Baltic Sea, and used explosives to sever three of the four pipelines. This comes as Poland says it was unable to carry out a German arrest warrant for a new suspect in its investigation into the Nord Stream attack, a 44-year-old Ukrainian diving professional who is alleged to have attached explosive charges to the pipelines. Polish authorities say the suspect fled to Ukraine in July. For more on the investigation, we speak with German journalist Holger Stark, deputy editor-in-chief and head of the investigative team at Die Zeit, who has been reporting on the Nord Stream attack for years.