SHJ: As mentioned previously in these forums, placing a/c on the Russian register requires importation of said a/c which is very expensive. Another aspect to consider are the leasing arrangements. It could be the leasing company registering the a/c, not the operator. Nothing to do with hiding anything.
Point taken mr HT, I was more thinking of the thousands of biz jets registered amongst all the 'convenience' registers to companies within companies etc.
SHJ