Russian Hypersonic Missile Scientists Accused of Treason.

Three Russian academics who have worked on hypersonic missile technology face "very serious accusations" of treason, according to the Kremlin. The case has spread alarm through Russia's scientific community. President Vladimir Putin has boasted that Russia is the global leader in hypersonic missiles, capable of travelling at speeds of up to Mach 10 (12,250 kph) to evade enemy air defences. The open letter from their colleagues at ITAM - the Khristianovich Institute of Theoretical and Applied Mechanics in Novosibirsk - said the materials the scientists had presented in international forums had been checked repeatedly to ensure they did not include restricted information.