Athletes from Russia and Belarus, the nation which aided President Vladimir Putin's invasion of Ukraine a year ago, have been largely banned from international competitions since.

But the International Olympic Committee (IOC) has opened a door to their competition in qualifiers and potential participation as neutrals at the 2024 Paris Games.

"For as long as there is an ongoing war in Ukraine, participation of the Russian and Belarusian athletes in the Olympic Games under any flag is unacceptable," Latvia's National Olympic Committee (NOC) said in a statement on Wednesday.

The two countries' presence in Paris would be an "encouragement for further escalation of warfare, and normalisation of war crimes and brutal violence," it added, saying Latvians should not take part in any competitions with athletes from Russia or Belarus.

Russia invaded Ukraine on February 24, 2022, with some of its troops entering from territory in Belarus, and has been bombarding Ukrainian cities since.

Ukrainian President Volodymyr Zelenskiy's government has also threatened to boycott the Olympics, but Russia has said a campaign to exclude it from international sport will fail.

Moscow says it is defending its own security and denies accusations of widespread atrocities in Ukraine.

Latvia, which borders Russia, has been a strong supporter of Ukraine together with Baltic neighbours Estonia and Lithuania. But neither of those nations are considering boycotts of Paris, their Olympic committee heads told media.

The Baltic ministers of sport will meet on Thursday to discuss a joint appeal to the IOC to ban Russian and Belarusian sportsmen from all international competitions, Lithuanian Minister of Education, Science and Sport Jurgita Siugzdiniene said on Wednesday.

Australian Associated Press