A WhiteWins lawyer contacted the seller, requested his contract with the developer and made an inquiry to the land registry about the status of the property.
It turned out that the land registry had not issued the title deed to the developer because of deviations from the approved architectural design. The certificate of completion listed the non-conformities, and until they were fixed the villa could not be registered in anyone's name.
This is exactly why the seller never registered the property in his own name.
The lawyer then made inquiries about the developer and learned that its licence had not been renewed since May 2021 and the company was in liquidation. Getting it to fix the defects at the property would be difficult or impossible.
The realtor did not try to deceive Sergey and Dinara: the law he referred to really does allow selling property through an assignment of claim. But for the buyer to register ownership successfully, the developer had to remedy the violations.
In this case there was nobody to do it: the developer was no longer operating and would be fully liquidated within a few months.
Trust, but verify! A superficial check of the documents could have cost the buyers dearly, but common sense and caution told them to ask for a "second opinion".