I didn't quite understand who sent the email or to whom. Did you send an email to Tatiana's email address ?
If you are blocked in their's phones and in various Internet applications, she, and her daughter as well, then it is clear that they do not want to communicate with you .
But if you want to find out the truth and get at least some answer , then there is only one way out : to go to Ukraine and find out "what happened" on the spot. Of course , you will need the help of reliable people there. Because, even if you know the actual address of residence of your wife or her daughter, you don't need to come there alone, and it's even dangerous.