Protasevich's interview comes ten days after Belarusian authorities pulled him off a Ryanair flight and arrested him on terrorism charges.
Natalia Protasevich spoke about her son at a press conference at the Belarusian House Foundation in Warsaw, Poland, on Thursday.
On Sunday, Belarus intercepted a Ryanair flight from Greece to Lithuania and arrested a dissident on board.
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The video showed Sofia Sapega saying she edited a Telegram channel that "publishes private information about internal affairs officers."
Belarusian dissident Roman Protasevich's activism against his country's tyranny dates back to 2011, when he was just 16 years old.
Roman Protasevich was arrested on Sunday after a plane carrying him to Lithuania was forced to land in Belarus.
Belarusian authorities on Sunday diverted a Ryanair plane and arrested Roman Protasevich, an outspoken critic of President Aleksandr Lukashenko.
According to eyewitnesses, a flight attendant cited "legal agreements" as the reason the plane had to land.
The lawmakers called on the president to ban US aviation companies "from entering Belarus' air space" after the arrest of Roman Protasevich.
Roman Protasevich's arrest drew international outrage as EU leaders condemned the forced grounding and called for his "immediate release."
Sofia Sapega, 23, and Roman Protasevich had been vacationing together in Greece, a spokesperson from her university told Reuters.
Roman Protasevich, a vocal critic of Alexander Lukashenko, said he was treated "lawfully" by authorities in a video shared by pro-government channels.
Roman Protasevich, 26, was arrested after his Ryanair flight was forced to land in Belarus, where he was arrested and accused of terrorism.