Hello,
Thanks for all the replies so far. following extensive/excessive internet searches, I think we can say that the plane is a Morane Saulnier Type G :
https://bayourenaissanceman.blogspot...airplanes.html
Davilla and Soltan ,mention three trainer versions built in the Russian Empire : with the Kachinsky undercarriagee;built by Slyusarenko; modified by a lieutenat Fride. Possibly the aircraft shown is one of these variants?
Regards,
Clint