Are we still at war with Russia or something? I don't understand why Russia is being demonised in the media so much the last 6 months.
Moreover, it's not about sharing info to stop terrorists, it's about burning an intelligence asset inside ISIS, and possibly getting him or her killed. And not even a US asset; one from one of our allies, reportedly Israel. This will make our allies less likely to share intel in the future and make us all less safe.