Mr Putin
Liberal spinelessness never ceases to amuse me. Le Gentle Sirs would never dispense with a title even when insulting someone.
Calling a President “Mr” is actually considered an insult in liberal circles.
Actually not only liberal, but it’s pretty archaic outside of it - if you read Lenin, you can exactly pinpoint the moment when Lenin ended friendships and aquaintances when he stopped calling people by name, pseudonym or comrade and started going by “Mr”.