Hearing it in Russian takes him off guard and he laughs slightly, turning his head so he can look up at Ethan under his eyelashes.

"How long have you been saving that one?"

The pronunciation was only a little off... but like hell he's going to say anything about it now. The fact he said it at all, that he must have learned it just so he could say it in this situation, is more than enough to make him all warm and fuzzy.