A trio of Vladimir Putin's leading hypersonic scientists have been detained on suspicion of high treason in what fellow scientists have declared a 'witch hunt' Aerodynamics specialist Dr Valery Zvegintsev, 78, is the latest of three prominent scientists from the Khristianovich Institute of Theoretical and Applied Mechanics in Novosibirsk to be arrested on extremely serious charges. Zvegintsev, 78, along with Anatoly Maslov and Alexander Shiplyuk, are seen as key figures in the development of Russia's hypersonic weapons programme which is thought to be one of the world's most advanced. News of their detention on suspicion of high treason comes days...