Actually, the Russian Ministry of Education had invited them. Faced with the need for new approaches to moral education after the demise of communism, the Russian Ministry of Education turned to a group of Western evangelical Christians called the CoMission for help. Oddly enough, a government that had promoted atheism, destroyed churches, and persecuted Christians for more than seventy years now found itself partnering with Christians to train their educators to teach ethics.
While a few books have described the changes in Russian public schools, this book, first published in 2002 and then in 2018 (new edition) provides the first in-depth case study of moral education in Russia after communism. Link