Russian and Belarusian athletes were on Thursday banned from the Beijing Winter Paralympics over the war in Ukraine, with organisers bowing to international pressure and threats of a boycott.
The International Paralympic Committee (IPC) had just a day earlier said athletes from the two countries would be allowed to compete as "neutrals" in the Games, which start on Friday.
It said that was the "harshest punishment" the IPC could dish out under its rules.
But organisers reversed that decision less than 24 hours later, meaning 83 athletes from Russia and Belarus, which hosted troops for Moscow's attack, will now be packing their bags and heading home.
"In order to preserve the integrity of these Games and the safety of all participants, we have decided to refuse the athlete entries from RPC and NPC Belarus," the IPC said in a statement.
"To the para-athletes from the impacted countries, we are very sorry that you are affected by the decisions your governments took last week in breaching the Olympic Truce. You are victims of your governments' actions," IPC president Andrew Parsons told reporters.
The International Olympic Committee (IOC) earlier this week urged sporting federations across the world to exclude athletes from the two countries.
Multiple Paralympics committees around the world, teams and athletes had threatened not to compete if the Russian and Belarusian athletes were present, which was "jeopardising the viability" of the Games, organisers said.
"Ensuring the safety and security of athletes is of paramount importance to us and the situation in the athlete villages is escalating and has now become untenable," the IPC said in a statement.
Parsons said he expects the two countries to take legal action against the decision.
"I hope and pray that we can get back to a situation when the talk and focus is fully on the power of sport to transform the lives of persons with disabilities, and the best of humanity," Parsons said.
The previous decision to allow Russian and Belarusian athletes to compete had drawn a swift backlash on Wednesday.
Germany's top Paralympic official said the decision lacked courage.
"It's a dark day for the Paralympic movement," the country's Paralympic Committee President Friedhelm Julius Beucher told AFP.
Athletes from Ukraine arrived in Beijing on Wednesday after a gruelling and logistically challenging journey from their homeland which has faced a full-scale invasion from Russia.
More than half a million Ukrainians have fled to neighbouring countries.
Earlier on Thursday, Ukraine's biathlon team members were preparing for competition -- hitting the slopes for skiing and shooting training in Zhangjiakou.
The small Eastern European country has punched above its weight in previous Paralympic winter events, with frequent podium finishes in the biathlon and ski competitions.
The delegation took home 22 medals in 2018 -- including seven golds -- gaining the sixth spot on the world tally.
For some of the team, the emotional rollercoaster and disrupted focus will be a case of deja vu.
During Russia's hosting of the Winter Paralympics in 2014, Ukrainian athletes had to grapple with Moscow's takeover of the Crimea peninsula.
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