It is clear that the opinion it's pro-Russian is widespread enough they need to make advance disclaimers. You wanted "a single example backing up the claim", you got one - from the horse's mouth.
You have again failed to meet the characterization of "a thoroughly pro-Russian think tank". If you are unable to find any actual evidence that fits that description then you should just admit as much
Would you honestly genuinely describe this as "a thoroughly pro-Russian think tank"? Dishonesty