The Zenit M surely and absolutely is not a Leica; I'd instead say that if Voigtlander decided to team up with Leica and make a digital rangefinder camera that Zenit is giving you pretty much what you would get.
It's been long rumored, but since it has just made an appearance at the Photokina 2018, we can all be sure that it's real. Krasnogorsky Zavod (KMZ), the manufacturer of the Russian brand Zenit, and German camera and optics company Leica Camera AG have indeed joined forces to create the Zenit M, a Full Frame digital rangefinder camera.