The Russians marched at the parade of athletes under number 77.
The Olympic champion in volleyball Maxim Mikhailov and the Olympic champion in fencing Sophia Velikaya became the standard bearers.
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The Tokyo Olympics have been postponed from 2020 to 2021 due to the coronavirus.
The games will be held from 23 July to 8 August.
Earlier it was reported that a protest against the Olympic Games was taking place near the National Stadium in Tokyo.