Dutch prosecutors on Wednesday demanded life sentences for three Russians and a Ukrainian charged with shooting down a passenger jet over Ukraine in 2014, killing 298 people.

They said the defendants, who are all at large, helped supply a missile system that pro-Russian separatists used to fire a rocket at Malaysia Airlines flight MH17.

"We demand that suspects (Igor) Girkin, (Sergey) Dubinsky, (Oleg) Pulatov and (Leonid) Kharchenko are convicted, each individually for the joint shooting down of an aircraft which caused death and...