Which country owns Telegram?

I'm curious, could you please clarify for me? Which country actually owns Telegram? I've heard rumors about Russia's involvement, but I'm not quite sure about the facts. I understand Telegram is a popular messaging platform with millions of users, so its ownership is surely a matter of great interest. Could you possibly shed some light on this matter for me? It would be greatly appreciated if you could provide a concise yet informative answer.