The factory will make them. Its the design bureau that are closed, so no new developments, but that doesn’t stop you building the existing stuff.

Correction, the company that specialises in Liquid fuelled ramjets has closed, not all companies with liquid fuelled ramjet development capability has closed.
In other words liquid fuelled ramjet development has not ended in Russia… it was obviously not earning enough to survive on its own. (no real surprise really as design bureaus in Russia don’t generally have that much earning power). In a way this was a bit like the MiG design bureau joining forces with manufacturing plants and other enterprises to become MIG. It still designs but is now part of an org that has money generation power to support its R&D capability.