Who was Konstantin Kilimnik working for?

The guy Muller report claims to have been a "Russian asset" was in fact working for the US State Department since 2012-13. He also "did not appear to hold any allegiance to Moscow and was critical of Russia’s invasion of the Crimean territory of Ukraine".

https://thehill.com/…/447394-key-figure-that-mueller-report-linked-to-russia-was-a-state-department