In this Tuesday, Sept 9, 2014 file photo, a stack of preliminary reports by the Dutch Safety Board on the crash of Malaysia Airlines flight MH17 is displayed at the board's headquarters in The Hague, Netherlands. An international team of investigators says that detailed analysis of video images has established that the Buk missile that brought down Malaysia Airlines Flight 17 nearly four years ago came from a Russia-based military unit. Wilbert Paulissen of the Dutch National Police said Thursday, May 24, 2018 that the missile was from the Russian military's 53rd anti-aircraft missile brigade based in the Russian city of Kursk.