However, this may be a fake, for two reasons:
Russian Ministry of Defense denies losing any helicopters (or personnel) in Palmyra.
The supplied photos appear to be processed with Photoshop, in exactly the places that show damaged craft. However, there seems to be a twist here: per analysis on a Russian site, destroyed craft is genuine... but the photos with the original craft were photoshopped.
I'm not digging further into this myself, but here is the link to the Russian site that talks about this: http://chervonec-001.livejournal.com/1359221.html