In fact he talks with Gatien in French from minute 18:15 he said something like "est tienne la balle aussi" (you have the ball, too) on reference it was Gatien who served.
Must have been a bit awkward for JOW sometimes as Gatien was speaking french most of the time when he was joking around and he wouldn't give a quick translation in english. It can be slightly uncomfortable when you can hear laughs from the audience but you don't really know why... Nonetheless, he seemed to have fun and didn't take himself seriously, he was really in the mood of exhibition. Gatien is a character as well, this event was really enjoyable :)
Does he speak russian? How do you know that, and what level of russian is it, becouse to say 10 words in sny language cant be classified as speaking the language. As far as i know, Janne knows swedish, english, german, and some chinese as well Long live The King of table tennis