On 8 January 2020, the Ukrainian government said that it will send experts to Tehran to assist with the investigation. Ukrainian President Volodymyr Zelensky instructed the Ukrainian General Prosecutor to open a criminal investigation into the crash.[1] The Ukrainian Embassy in Iran said that preliminary details pointed to engine failure; it also issued a statement ruling out terrorism, but quickly removed the statement.[34] Later the same day, the Ukrainian Embassy in Iran said that anything was possible and refused to rule out that the plane was struck by a missile.[35]