Lost Soviet successors to the Mi-14 and Ka-27

Was the Soviet Navy developing replacements for the Mi-14 and Ka-27 when the USSR collapsed?

Yes, but the collapse destroyed much of the research base and dispersed the engineers, leaving only fragments to reappear in later Russian programs.

Replacement research did exist, but much of the Soviet defense-development ecosystem disappeared in the collapse. Some later Russian projects descend from ideas that survived, while many engineering teams fragmented through death, emigration, and institutional breakdown.