How to make a transition to a scientific position (from engineering position)?
Since you already have a PhD, and have a strong work experience with one of the top companies with the research-like work, not to mention your published work that you have mentioned, you should be able to get a grant from one of the prominent universities in Russia. If not, then try a country where you can happily continue your research while still supporting your family. As Dexters above has suggested that, with your passion you have nothing to lose, it stands true if you keep trying and not give up just yet. In the meantime you could try to publish your work with the top journals.
Good luck with your endeavours.