I think Mongolian often uses a Cyrillic alphabet, and that doesn't look particularly Cyrillic to me, just smudgy and hard to read (but the latin alphabet).
It's definitely Cyrillic, and definitely Mongolian. The beginning of the third line on the second page reads хуссэн бухнээ, and googling finds this phrase on Mongolian pages. No idea what any of that means, though.
It is NOT mongolian. In mongolian there are no letters Ә, Ғ, Қ ... This is kazakhish. I am from Germany but have roots from Azerbaijan, therefore I understand altaic-turcis languages. It looks similar to mongolian but it isn't.
