Safety concerns for the athletes and the community were among the reasons cited to cancel the event in Russia.

More than 2,000 athletes from 108 countries were expected to compete across seven sports at the Special Olympics.

"We can no longer ensure the effectiveness of the World Winter Games in Kazan or the safety of our athletes and community," a Special Olympics statement read.

"The horrific violence in Ukraine, the extensive sanctions implemented by the international community, and the uncertainty and fear being experienced around the world make it impossible to proceed.

"We are devastated by the fear and destruction being experienced by our athletes and community in Ukraine.

"Persons with an intellectual disability are suffering disproportionately, unfairly, and tragically in this war, as they have during the pandemic.

"We join our voices to millions around the world demanding peace and an end to violence immediately."

Special Olympics International also sympathised with Ukrainian and Russian athletes, who have trained for years to participate in the event.

The organisation also vowed to remain resolute in their commitment to the athletes irrespective of their political stance and nationality.

"We are a community of people who are unwilling to stop at anything to create a worldwide movement of inclusion with our athletes leading by word, by vision, and by example," the organisation said in a statement.

"We will stay focused on that mission in new and even more powerful ways in the days, months, and years ahead."

Special Olympics was founded in 1968.

The first World Winter Games was held in Steamboat Springs in Colorado in 1977.