Be logged in and use the deletion link named here.
URLS:
http://mail.yandex.com/
https://passport.yandex.com/passport?mode=delete
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.