So if a Lunev-Snowden (or whomever) swap took place, I'm wondering if maybe this 23Feb18 Ukraine/Russian prisoner swap may have been the first step onto the "bridge." Not all have been repatriated, so it might be possible future swaps include those not really wanting to go back.

https:// www.stamfordadvocate.com/news/media/Ukraine-crisis-Prisoner-exchange-begins-1155538.php