He simply added a hundred random Russian speakers on Skype as friends, and then he opened a chat window with one of them and wrote "Hi" in Russian.
무작위로 러시아인 백명을 스카이프에 친구로 등록하고, 개인 대화창을 열어, 러시아어로 "안녕"이라고 쓰는거죠.