The altitude didn't seem particularly high. I think it could have been an SA-8 Osa as well. The missile rocket motor was ignited until impact. According to Wikipedia (I know), the 9K33M3 missile has a 2s boost and 15s sustain burn time.Buk? The Russian MOD is claiming to destroy low single digits of Ukrainian Buks per day. Let's say 3 per day on average. Quick Google gives Ukraine 72 Buks per Wikipedia. At that rate that will take Russia 24 days from the start of the campaign just to fully suppress the Buks. Not to mention the remaining S-300s which apparently haven't been fully destroyed going into day 11.
The aircraft was identified today as Su-34. That's the 4th aircraft of that type the Russians have lost thus far.