According to the research, a Western secret service is said to have sent a tip to European partner services in the autumn, i.e. shortly after the destruction, according to which a Ukrainian command was responsible for the destruction. After that, there are said to have been further intelligence indications that a pro-Ukrainian group could be responsible.
Courtesy of Google-Translate.
Source:https://www.tagesschau.de/inland/innenp ... g-101.html