I can't emphasize enough how important these books were in shaping my childhood in a rural town in India. I still vividly remember making a fuss when Misha and Sputnik stopped after the fall of Soviet. A part of me is forever indebted to Russia for this.
Given the strong Communist presence in Andhra Pradesh, the state I am from, we were lucky to have a great number of these books translated to Telugu, by no less than legends like Sri Sri.
I have some of the children's books uploaded on my blog at http://linkdot.link/sooviytt-prcurnnlu-childrens-books.html
PS: I named my daughter Aelita after the science fiction classic.