When you combine this information about the probable missile being Israeli-made with the information Sott.net found about Su-25s having been upgraded by an Israeli firm...
'MH17 Who Dunnit? Western Media Silent on the Evidence', published on Sept 1st, 2014:
The Russians have stated that the jet they spotted on radar near MH17 at the time of the crash was most likely an Su-25. The Su-25 basic model is a rather 'dated' fighter aircraft that does not have a pressurized cockpit meaning that flying for any length of time above its operational ceiling of 7,000 meters is problematic for the pilot (MH17 was at 10,000 meters). The standard SU-25 also has fairly basic instruments and weapons, with only a laser guidance system for rocket and canon fire which, apart from being designed for ground target acquisition, has an error range of up to 13 feet. If the Su-25 came no closer than 3-5 kms and was only equipped with laser guidance, accurate targeting of the cockpit would not have been possible... with a standard Su-25.
Since the 1970s, several variants of the Su-25 have been produced, the most recent of which is the Su-25KM 'Scorpion' which was announced in early 2001 by the original manufacturer, Tbilisi Aircraft Manufacturing in Georgia, in partnership with Elbit Systems of Israel.
The aircraft uses a standard Su-25 airframe, enhanced with advanced avionics including a glass cockpit, digital map generator, helmet-mounted display, computerized weapons system, complete mission pre-plan capability, and fully redundant backup modes. Performance enhancements include a highly accurate navigation system, pinpoint weapon delivery systems, all-weather and day/night performance, NATO compatibility, state-of-the art safety and survivability features [...]