Prime Minister of Ukraine Oleksiy Honcharuk (R) and Secretary of the National Security and Defense Council of Ukraine Oleksiy Danilov (L) attend a briefing in Kiev on January 8, 2020. - All passengers and crew on board the Ukrainian Boeing 737 plane that crashed shortly after take-off from Tehran on January 8, 2020 were killed, Ukrainian President Volodymyr Zelensky said. (Photo by Genya SAVILOV / AFP)

Prime Minister of Ukraine Oleksiy Honcharuk (R) and Secretary of the National Security and Defense Council of Ukraine Oleksiy Danilov (L) attend a media briefing in Kiev on January 8, 2020. - All passengers and crew on board the Ukrainian Boeing 737 plane that crashed shortly after take-off from Tehran on January 8, 2020 were killed, Ukrainian President Volodymyr Zelensky said. (Photo by Genya SAVILOV / AFP)

Prime Minister of Ukraine Oleksiy Honcharuk speaks during a media briefing in Kiev on January 8, 2020. - All passengers and crew on board the Ukrainian Boeing 737 plane that crashed shortly after take-off from Tehran on January 8, 2020 were killed, Ukrainian President Volodymyr Zelensky said. (Photo by Genya SAVILOV / AFP)