To answer your question, yes, there is a way to test his Russian proficiency. Language Testing International http://www.languagetesting.com is the licensee of the ACTFL. Contact universities directly and ask if they will accept LTI certificates. BYU also has language testing available. Many universities use BYU’s testing program for placement.
Whether or not being fluent in Russian and English satisfies admission requirements…I would go directly to the universities and inquire.