The trial in the Hague, Netherlands of three Russians and a Ukrainian (who are still at large) for the murder of 298 people aboard Malaysia Airlines flight MH17, shot down over Ukraine in 2014. The Boeing 777 went down amid a conflict in eastern Ukraine, after Russian-backed rebels seized the area. Investigators say they have proof the Buk missile system that shot it down came from a military base in Russia. The four men are: 1) Igor Girkin, also known as Strelkov. He is a former colonel in Russia's FSB intelligence service, given the title of minister of defence in the rebel-held eastern Ukrainian city of Donetsk, prosecutors say. 2) Sergei Dubinsky, known as Khmury. He was employed by Russia's GRU military intelligence agency, according to investigators. They say he was a deputy of Mr Girkin and in regular contact with Russia. 3) Oleg Pulatov, known as Giurza. He is allegedly a former soldier with GRU special forces who became deputy head of the intelligence service in Donetsk, and 4) Leonid Kharchenko, known as Krot. He is a Ukrainian national with no military background who led a combat unit as a commander in Eastern Ukraine, say prosecutors.