Russian Defense Ministry published new footage showing air campaign in Syria. In this video Russian bomber jets hit ISIS terrorists located to the south from Tertiyah, Idlib province. There is also a training camp being destroyed in wooden-mountainous area in Latakia province.
Great documentary : Russian Air Power /Su-24 II Su-34 II Su-25 II MiG-29 II Su-27 (25 min – English language)
At 0.20 you can see how pilots entering into cabin/cockpit of Sukhoi Su-34 Fullback..and why they need helmets :)