Why do Russians say Z?

Could you please explain why Russians tend to say the letter "Z" in certain contexts? I've noticed this trend recently and I'm curious as to the reason behind it. Is it a cultural phenomenon, a symbol of some sort, or perhaps a reference to a popular trend or event? I'd like to gain a deeper understanding of this seemingly unique linguistic behavior among the Russian community. Could you elaborate on the origins and significance of this practice? Thank you for your assistance in clarifying this matter.