IOC president Kirsty Coventry suggested, external in February that Russia could compete at the Games in Los Angeles in two years time.
But the IOC has decided that doping issues mean it is not ready to lift its ban on the country.
It explained that, unlike Russia, the National Olympic Committee (NOC) of Belarus “is in good standing and complies with the Olympic Charter”.
The World Anti-Doping Agency (Wada) recently announced that more than 300 sanctions have been handed to Russian athletes following the seizure of Moscow laboratory data in 2019.
“While the ROC (Russian Olympic Committee) has held constructive exchanges with the IOC on its suspension, it remains suspended while the IOC legal affairs commission continues to review the matter,” said the IOC.
“The IOC EB (executive board) also noted with concern the recent information that has led to the World Anti-Doping Agency (Wada) looking into the Russian anti-doping system.
“The IOC EB would therefore like to obtain a better understanding of this situation.”
In September, the International Paralympic Committee lifted its ban on athletes from Belarus and Russia competing at the Winter Paralympics earlier this year, while World Aquatics has also announced athletes from the two countries can compete under their nations’ flags.
Fifa president Gianni Infantino suggested in February that world football’s governing body will look at lifting a ban on Russia, a move called “irresponsible” and “infantile” by Ukraine sports minister Matvii Bidnyi.