When I learned Russian, I did an official examination and got a certificate assessing my language level. As this certificate is quite hard to get (it is the equivalent of a C1 CEFR level), I would like to highlight it. How can I do that on my resume? Should I make a comment about it in the language skill section or put it in education?
Disclaimer: my question is not about how to indicate languages on a resume, but specifically about highlighting a language certificate.