Yulia Efimova is relieved that her Olympic "nightmare" has come to an end and accused outspoken rival Lilly King of starting a "war" in Rio.
The Russian swimmer was provisionally banned after testing positive for meldonium this year, but governing body FINA overturned the decision on advice from the World Anti-Doping Agency.
After being cleared to compete in Brazil, Efimova claimed silver medals in the 100 metre and 200m breaststroke, but was jeered at the Olympic Aquatics Stadium.
King took aim at Efimova after beating her in the 100m final, stating: "I'm just happy for the USA to know I am competing clean and doing what is right."
And Efimova felt the American, who won two golds in Rio, was out of order.
"It was like a nightmare," Efimova told USA Today Sports.
"This completion [of the swimming competition] is a relief because I love racing, but this was more like a war. It was awful. She is young, but she should understand more."
Efimova added: "[King] is young. She doesn't know sometimes how life is going on.
"I hope that she changes, changes her mind and everything."