Nicolai Miklouho-Maclay (Miklouho) - helping identifying relative of Nicholas Miklouho-Maclay in a photo on the profile of Lev Borisivich Rukhin

There is a photo of my grandfather, Lev Borisivich Rukhin, with a relative of Nicholas Miklouho-Maclay. Can anyone possibly identify this relative? This relative would be the man on the right.

Other facts about the photo:

It was likely taken in 1940's Leningrad at the university. The two men are surrounded by students. It was likely a holiday, either May 1 or November 7.

I hope this link takes you to the photo directly:

https://www.geni.com/photo/view/6000000193440985830?album_type=phot...