For the TL/DR crowd... here's the "
why".
So, why is Investigative Committee member Markin speculating about conspiracy theories surrounding US moon landings that happened decades ago? In his op-ed, the Russian official also emphasized that “US authorities had crossed a line by launching a large-scale corruption probe targeting nine Fifa officials,” according to the Moscow Times.
And even they aren't suggesting the whole "Capricorn One" film stage scenario. I'm sure Soviet SIGINT was watching the Apollo missions with everything they had, and woudn't have wasted a second on exposing us on any fakery back then.
“We are not contending that they did not fly [to the moon], and simply made a film about it. But all of these scientific — or perhaps cultural — artifacts are part of the legacy of humanity, and their disappearance without a trace is our common loss. An investigation will reveal what happened,” Markin wrote, according to the Moscow Times translation.
They're not wrong about that. A crapton of moon rock and Apollo artifacts, gear, memorabilia, documents have gone missing due to people with sticky fingers, or incompetence at a bunch of universities and museums. There's been several U.S. and other countries news stories and editorials on it.
Simple answer, P.O.'ed by what they see as American hegemony by busting FIFA corruption, he singles out what he thinks of as America's crowning achievement, the moon landings, and attaches tit-for-tat finger pointing about all the thievery surrounding it.