If we assume "etting Snowden fall into the clutches of Russian intelligence may be a far better deterrent to future leakers than a 'clean' prosecution and impri

If we assume "etting Snowden fall into the clutches of Russian intelligence may be a far better deterrent to future leakers than a 'clean' prosecution and imprisonment here in the US", then surely if the Russians are capable of thinking long-term then treating Snowden nicely is in their best interest (why would they want to play into discouraging future American leaks?).