Here is an interview with the producers on last nights episode:
http://tvline.com/2018/05/30/the-americans-recap-series-finale-season-6-philip-elizabeth-russia-fx/A few excerpts:
TVLINE | You left the question of whether or not Renee is a spy unanswered. Was that to leave Stan wondering about who he's sharing his bed with? WEISBERG | Well, that's certainly something that's going to hang over his marriage a bit, one would think. To us, in a way, we thought that [revelation from Philip] was a powerful thing to give [Stan], in terms of his own struggle, but also in terms of who Philip had become, and where their relationship was at. Philip wasn't going to walk out of that garage without telling his friend what he thought might be possible there, even if he wasn't sure.
TVLINE | So why did Stan decide to step aside and let the Jennings family go, when he had them cornered?
FIELDS | You know, that falls into the category of questions we want to let the audience come up with their own answers to, rather than impose our own on it. We can certainly give you an answer. We have answers. But we want to sort of let the story speak for itself on that one. People will come up with different answers, and their own interpretations of where Stan's at, and what happened during that scene to bring him to that point.
TVLINE | What kind of consequences is Paige facing now, after having stepped off that train? WEISBERG | Well, first of all, the consequences she's going to face for everything that's happened, on an emotional and personal level, are obviously extreme. But the question of whether or not she's going to face legal consequences, I think, is a little bit muddy. I don't think we know the answer to that. It's possible that the FBI may not have evidence about anything she's done that's clearly a crime. So she may not be in any kind of extreme legal jeopardy, as long as she doesn't walk herself into a corner. We don't think that it's clear she's headed to jail.
TVLINE | Oleg might be the one to face the most consequences from all of this. It was really kind of heroic of him, though, right? He was willing to spend the rest of his life in prison because this was that important to him.
FIELDS | Yeah, that's a high price he paid. That's something you try not to think about when you take those risks. But ultimately, there he is. He's left a lot behind, and he and his family are suffering a lot. For me and Joe, that's our sweet spot: making everybody suffer. [
Laughs]