> Not sure, but if that letter exists in unicode and not in your font

  No, the letter doesn't exist at all in Unicode, and most likely won't be
encoded in the future either, due to the rule known as "normalization
stability".  Generally speaking, you have to input it as Cyrillic a followed by
combining acute accent, from the Unicode point of view.  Inside TeX, you should
of course build it with an accent macro.

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