It has been a year since Malaysia Airlines flight MH17 tragically crashed in eastern Ukraine, killing all 298 passengers on board. Probes into disaster have been sluggish and secretive, fueling speculation concerning who brought down the plane and why.

The Malaysian Airlines flight MH17 left Amsterdam at 12:14 local time and was heading to Kuala Lumpur with 283 passengers and 15 crew members onboard a Boeing-777.