I think that what happens with Yulia is that she is forced to go into a range which she can no longer achieve easily, and therefore she loses control over her voice and starts having problems over and over.
Of course she can sing, and will sing, but never like she did when she recorded "Nas Ne Dogoniat". I think Ivan should make Lena hit the higher notes, not Yulia anymore. Although Lena's voice has also changed a tad due to smoking, she doesn't have the throat problems that Yulia does, so it's a lot easier for her.
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