There are no original Russian factories still producing Nixie tubes. The Chinese still make some (or are still selling factory stock).
Dalibor Farny has a business making Nixie tubes, but that is a fresh-from-scratch start. There have been a few crowd-funded attempts to make replica IN-18 Nixies, but that is neither the original factories nor the original equipment (part, but not all, of the IN-18 assembly line was auctioned off 10 or so years ago and vanished). There are still a lot of New Old Stock Nixie, VFD, and more esoteric displays available from former Soviet countries, but those are old tubes that have been hoarded.
You may be thinking of the Svetlana / New Sensor / Reflektor / Xpo-pul (take your pick) audio tubes which are still being manufactured.