Unseen on camera footage, he is heard telling a Ren TV journalist he could not tell "how many of them are among us, because it may cause panic." He said more details could be found in Barry Sonnenfeld's "Men in Black" films.
http://news.msn.com/pop-culture/russian-prime-minister-jokes-about-secret-files-on-aliens
http://news.msn.com/pop-culture/russian-prime-minister-jokes-about-secret-files-on-aliens