The top seeds are bidding to win the mixed-team world championships for the first time, but a major shock was on the cards when the Japanese went 2-1 down.
The unfancied Russians enjoyed surprise victories in the men's singles and men's doubles, before the Japanese fought back in the Chinese city of Nanning.
Japan, who along with the hosts are the favourites, decided to rest world champion Momota along with their first-choice men's pairing.
They were initially unaffected and won the mixed doubles in the opening rubber. But Russia then took advantage of Japan's weakened side with Vladimir Malkov, ranked 62, beating Momota's replacement Kenta Nishimoto -- 10th in the world -- and also winning the men's doubles.
"It was a relief to get the winning point," said Fukushima.
"In the end it worked out well for us.
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