to be propaganda mechanisms for their war. it is dangerous when small little symbols become proxies for being a loyal citizen in an au authoritarian regime because those that don't wear it could be targeted by the state. >> reporter: in this highly produced propaganda video, russian men wearing that letter declare their support for the invasion, chanting "for russia, for the president, for russia, for putin." an aerial shot shows a giant z, a traditional symbol of russian military glory, usually associated with victory over nazi germany. by accident, or design, a character that doesn't feature in russia's alphabet has become an iconic symbol of putin's invasion and a propaganda campaign, to win support among his people. phil black, cnn, london.