KYIV, Ukraine—A dissident journalist arrested when Belarus diverted his flight said in a video from prison that he was set up by an unidentified associate. The footage of Roman Protasevich was part of an hour-long documentary aired late Wednesday by the state-controlled ONT channel. In the film, the 26-year-old Protasevich is also shown saying that protests against Belarus’ authoritarian President Alexander Lukashenko are now pointless amid a tough crackdown and suggesting that the opposition wait for a more opportune moment. The film claimed that the Belarusian authorities were unaware that Protasevich was on board the Ryanair jet en route from Athens to Vilnius when flight controllers diverted it to Minsk on May 23 citing a bomb threat. No bomb was found after the landing, but Protasevich was arrested along with his Russian girlfriend. The flight’s diversion outraged the European Union, which responded by barring the Belarusian flag carrier from its …