Any glaring problems with this Cyrillic character set?

I've been working on this sans text face for a while now and have recently added a Cyrillic character set to the existing Latin and Greek sets. I realise there is always room for improvement, but I've had a lot of support elsewhere and am generally satisfied with the overall look and feel of the font. The purpose of posting this is principally to ensure the newly-added Cyrillic characters are correctly formed and spaced (please note that I have not started applying kerning yet).

I've attached a PDF showing all three scripts at various sizes. Whilst my focus here is on the Cyrillic characters, I'd welcome feedback from anyone who spots an issue elsewhere that needs to be addressed.

Thanks so much in advance.