The case again highlights the challenges of mitigating state-sponsored information operations.

Twitter also announced it would no longer accept advertising from state-controlled news media.

It's hardly the first time Twitter has been used to amplify questionable narratives.

The takedown also highlights the difficulty of correct attribution.

The shift to use more real news marks a subtle upgrade in anti-detection techniques.

Not only did Russia's troll farm promote disinformation, a small handful tried making a buck, too.