That's interesting, tell him to come on by

I don't know jack about Soviet naval equipment, but always willing to be educated ;D
I wouldn't be surprised if he's having difficulty with more modern equipment; the Putin administration has in many ways curtailed the flow of information (sensitive and non) in the last few years in a very 1930s way. Censorship being a big one, but aside I think one of my instructors mentioned that access to archived, declassified information is more difficult (though not impossible) now as opposed to, say, 10 years ago.
If he's interested I could ask some of my contacts in the department here about getting hold of some of the information; we have a number of military historians here who might have documents from before the current period of increased censorship