South Koreans say Japan's 2020 Summer Olympics flag stirs memories of a violent, brutal past.
South Korea wants the so-called Rising Sun flag to be banned from venues at next year's Tokyo Olympics.
South Korea sees the flag as a symbol of Japanese "imperialism and militarism."
"The Rising Sun flag is akin to a symbol of the devil to Asians and Koreans, just like how the swastika is a symbol of Nazis which reminds Europeans of invasion and horror."
The Korean Sports & Olympic Committee says it has not yet made an official request to the IOC to ban the flag.
The flag disagreement comes amid an ongoing trade spat between the two countries, which has been raging since July.