ATGM's. Lots of nations use those, but i think only Slavic nations put them on tanks.
Check AMX-13/SS11
http://www.chars-francais.net/new/index.php?option=com_content&task=view&id=1252
http://cbx41.over-blog.com/photo-1363392-Mus-e-des-blind-s--Saumur-2009_0750_jpg.html