Russia will be without two of its Olympic figure skating gold medallists from Sochi 2014 at Pyeongchang 2018, including individual women's champion Adelina Sotnikova.
Sotnikova will not compete this season because of injury,
Yulia Lipnitskaya, meanwhile, a member of the Russian team that won the first-ever Olympic gold medal in figure team skating, has retired at the age of only 19.
Her mother revealed she had decided to quit the sport after receiving treatment for an eating disorder.
"Adelina Sotnikova will not compete this season because of injury," her coach Evgeni Plushenko, a two-time Olympic gold medalist, Russian news agency R-Sport.
"We all hoped we'd get this injury cured, but unfortunately it hasn't happened.
"The injury is still causing problems, [Sotnikova] can't manage full training sessions, and it's not right to go to competitions in this state."
Sotnikova made history at Sochi 2014 when she became the Russian woman to win the individual title.
Her victory was highly controversial, however, as it was claimed she received inflated marks from the judges after outscoring South Korea's defending champion Kim Yuna in the free skate.
A petition with two million signatures calling for an investigation but was rejected by the International Skating Union.
Sotnikova has not competed at a major event since Sochi 2014 due to injury and competing in the Russian version of Dancing with the Stars.
She split from her long-time coach Elena Buyanova in April to join Plushenko, who had only retired the previous month.
Sotnikova is believed to be suffering from an ankle injury.
It was reported earlier this year that Sotnikova is among athletes under investigation by the International Olympic Committee due to the manipulation of doping samples at Sochi 2014.
Lipnitskaya had been controversially preferred by Russia for the team event to Sotnikova for the team event at Sochi 2014 having beaten her a few weeks earlier to become the youngest European champion in history.
The selectors faith was justified when she helped them win the gold medal.
At 15, she became the youngest Olympic gold medalist under modern rules, being six days younger than American Tara Lipinski was when she won the singles title at Nagano 1998.
Lipnitskaya finished fifth in the individual event at Sochi 2014 but, like Sotnikova, has not competed in a major championships since.
"Yulia informed the management of the Federation about her decision to wrap up with her career back in April after returning from Europe, where she underwent three-month treatment from anorexia," Lipnitskaya’s mother told Russia's official news agency TASS.
Russian Figure Skating Federation President Alexander Gorshkov, however, claimed they had not received any official notification from Lipnitskaya that she had retired.