50万ルーブルのソースはこの辺か
さらに元のソースはテレグラムらしいけど

A man detained on suspicion of involvement in the Crocus City Hall attack has said he was promised a reward of 500,000 rubles ($5,400), according to a video posted on RT Editor-in-Chief Margarita Simonyan’s Telegram channel.

https://tass.com/emergencies/1764751　←　TASSなので注意

https://www.rt.com/russia/594774-simonyan-video-suspected-terrorist-interrogation/　←　RTなので注意

https://www.aljazeera.com/news/liveblog/2024/3/23/isil-says-it-was-behind-moscow-concert-hall-attack-that-killed-at-least-60