In the video, Protasevich's face appears to be marked with abrasions and bruises, suggesting that authorities subjected him to "torture or other ill-treatment" before recording the supposed confession, Amnesty International spokesman Alexander Artemyev told The Washington Post.
Ms McGlynn said: "If Belarus was allowed to raise money on the LSE again. after torturing, killing, and kidnapping journalists and members of the opposition, it would be a source of great shame for the United Kingdom and the London Stock Exchange".
Her son appeared in a video broadcast on Belarusian state TV on Monday in which he confessed to some of the charges against him.
Belarus President Alexander Lukashenko denied that the fighter jet was forcing the Ryanair plane to land as an "absolute lie" and defended his action to divert the flight as a necessary response to the bomb threat.
"On 23.05.2021, I took the same flight as Roman Protasevich". "I am. editor of Telegram channel Chernaya Kniga, which publishes private information about internal affairs officers", she said in the clip, after giving her full name, age, and nationality, per a Sky translation.
Belarusian authorities have presented no evidence that Sapega has links with the Telegram channel.
Ivan Tertel, head of the Belarusian state security agency that still goes under its Soviet-era acronym KGB, said Pratasevich told investigators about "the sponsors of subversive activities against Belarus, its mechanisms and special services and politicians behind it" and promised to release details soon.
World leaders have condemned authoritarian President Alexander Lukashenko for what many have described as a "hijacking", while the European Union imposed sanctions and US President Joe Biden described it as an "outrageous incident" and a "direct affront to worldwide norms".
The EU and Canada have banned their aircraft from using Belarusian airspace.
But Belarus has stuck to its story, saying it was responding to a bomb scare that later proved to be a false alarm.
In a statement, the North Atlantic Council (NAC) - the alliance's main political decision-making body composed of NATO ambassadors - condemned Sunday's forced diversion of the Ryanair flight to the Belarusian capital Minsk. "There are no refutations yet", Peskov said.
He said the goal of the country's enemies was to "dissolve the Belarusian people and start strangling their sworn enemy - the Russian people".
Lukashenko and his allies are under European and US sanctions over the violent crackdown on post-election protests that gripped the nation previous year.