You probably won't get the promised games. Sailornates nearly scammed another person I know. Again he wanted him to go first but because of the fact that Sailornite nearly did not have any forum activity he canceled the trade. I think that it is pretty sure that this person is a scammer and should be on the list.
He is. He can also prove his innocence by sending the promised games and I will publicly apologize to him, although in case this happens (which I doubt), he needs to be scolded for radio silence. I've had some good experiences before with trading games on GOG and that's why I went first (blind belief in mankind). Also, I thought there's some bigger control over GOG accounts. Mike_Cesara showed me that there isn't. When I saw his Steam profile is level 0, I knew what was happening. Steam can easily track where the games went. Hopefully they'll respond to my ticket.
You should have gotten more sceptic when he did not want to send you a single game after you already sent him several. But in general: never go first if there is not a good reason for it. HE is the one who was asking so HE should show you that he is trustworthy (which obviously he isn't).
Isn't Yandex Russian?
Aaaaaannddddd... his Steam profile just went completely private. :) I've also sent an e-mail to GOGcom support. Hopefully they'll unable this person to scam anyone anytime again.
I would not get up your hopes high. GOGs policy is simple: oif you don't want to get scammed don't trade keys at all. They allow trading but they don't want to control anything of it.