So clearly Anatoly wasn't completely certain of what to expect when he found Svetlana. He had an idea from Fayina's post, obviously, but he didn't know specifics. He knew she would obviously be in some state of closing off given she thought their daughters were dead, but he wasn't certain of how deeply she was affected. Because clearly she was cursed when their daughters were very much alive. Which meant this was much like a living fairytale like those he'd always told to their daughters, and which Jelena had fervent belief in.
All right, so Svetlana's body language upon his approach and speaking to her was something that was a dead giveaway. He could see how much she was hardening all ready. And from her words it was easy to glean what she was seeing and believing. So clearly she was seeing Molokov instead of her, given the reference to the threat from Bangkok, and also the mention of last year. There was also the information that Svetlana believed both him as well as their daughters to be dead, killed by Molokov. And considering she was seeing Molokov instead of him, that would make this whole talk that much more difficult.
Which left Anatoly with how to approach this. Talking was obviously not going to get him anywhere when she believed him to be Molokov. No matter what Anatoly may say, Svetlana would never believe he wasn't Molokov when, to her eyes and ears, he was Molokov. But as much as he also wanted to just close the remaining distance between them and kiss her, because clearly true love's kiss would fix this, was also possibly not the best course of action either given what he knew from the alternate world both he and Svetlana had been cast into. This was almost a situation where Anatoly was caught between a rock and a hard place. So all right, he was going to choose a path that was a combination of both approaches, both talking and planting the kiss. So choosing his words carefully, he tried for the least Molokov-y words to see if there was any sort of positive reaction Svetlana would have to them.
"Svetochka, what you are seeing is not real. You are under a spell cast by a witch. Just think about it, remember what world we are in, what impossible things we have witnessed happen here. This is a spell, a curse, just like in a fairytale." Because clearly Molokov would never give credence to fairytales. He would've just taken the credit for everything and wallowed in victory.