The details will come out, I heard on news today that the "mother" sent an email to someone in Russia asking how to return the boy but no further interaction was done. Even so, sending a 7-year-old to Russia without making sure anyone was there to receive him doesn't seem like it was a very well thought out move

If the kid was a terrible as she says, where is the evidence that she tried to get help? She was "homeschooling" both her natural son and this one; maybe she should have reconsidered this if it was too difficult.
Adoptions of other children from Russia could be complicated because of this woman's actions. There is no happy ending I see for anyone involved here.