I'm a little confused on how to fill out the names in the I-129F and G-325A because Russian and Ukrainian names are different than what I'm used to.

My fiancee is Ukrainian and the way she says her name is Morozova Kseniya Sergeevna. That is Family Name, First Name, Dad's Name

So my questions:

What do I put for the Middle Name?

On the G-325A, it first asks for her Family Name, then directly underneath that, it asks for All Other Names Used (including names from previous marriage). She is divorced and still retains her last name from that marriage. So which names should I put as her 'Family Name' and which for 'All Other Names Used'?

Thanks!