The rebels shot down an AN-26 transport plane above 21,000 feet on Monday 14th of July over the village of Izvaryne, ~95 km to the west of MH17 crash site. There was a realisation at the time that the Rebels had used a more advanced missile system.
According to a press release the transport aircraft was cruising at more than 21,000 feet, which should normally make it out of reach of most small arms and simpler shoulder-launched surface-to-air missiles (MANPADS) used successfully by the separatist forces in the east of Ukraine. Some Ukrainian sources even blame the Russian military to have fired the “more advanced” missile from Russian territory. If true, that would mean the first direct fire from the Russian military in the conflict in eastern Ukraine.
Ukraine: "Latest AN-26 downing more advanced"