I don't see the Japanese surrendering to the Soviets in this picture. If the Soviets were the reason Japan stopped fighting, and the US was inconsequential, why did the Japanese surrender to the US??
You really gotta stop reading anti-American liberal propaganda.
He must be reading The Guardian again where it is received wisdom that the Yanks did nothing (as well as the Brits) and the Ruskies won the war singlehanded. Pure garbage. If that had been true, why wasn’t Churchill on the phone every day with Stalin? In fact, he was visiting FDR and phoning him endlessly during WWII.