What Did Snowden Tell the Russians?

We're wondering how the Russians achieved total surprise in their invasion of Crimea, Ukraine.

We truly didn't seem to take the option seriously. Even as I wondered if I was really seeing Russian special forces fanning out in Crimea prior to moving in bigger units, I reported reports that said our intelligence reassured our leaders that Russia would not invade.

I have to wonder what Snowden told the Russians. I have no doubt that the Russians are capable of looking at our intelligence data and figuring out how we look at other countries in order to disguise their preparations for a major troop movement.

But I'm speculating.