That is exactly how the Kremlin and its servants (like this traffic cop) see the purpose of the state:
The bosses must be given every possible convenience and privilege in everything.
And after the bosses have made use of that privilege, they must be thanked for it — saluted.
Especially for those who are perfectly fine with point 2 and are already about to write, "they block roads for leaders everywhere":
How traffic is stopped in New York when the U.S. president visits.
How motorcades of heads of state move in different countries.
I once saw the Queen's motorcade in London myself. I was on a tour bus, and she drove past in the same flow of traffic, not very fast; you could see her clearly through the window (which was not tinted). No one stopped our bus. There were motorcyclists in the motorcade, and they simply directed nearby traffic to pull over to the side of the road.
And the United Kingdom is a much richer country than Russia, and it has fought and continues to fight more wars, which means there are certainly no fewer people who would like to kill the country's symbol than there are people who might want to assassinate the president of the Russian Federation. (In Russia, meanwhile, not only the prime minister but all sorts of riffraff, like deputy prime ministers, travel with these kinds of motorcades and road closures.) Yet somehow they manage to handle security without blocking the road for ambulances.