Arrests Made in Russian Hypersonic Missile Treason Case.

Three Russian scientists who worked on the country's hypersonic missile program have been arrested on suspicion of high treason, causing concern among their colleagues and raising fears of a decline in research. The arrests come as Ukraine claims to have shot down six Russian Kinzhal missiles in a single night, which were once touted as "invulnerable" by President Vladimir Putin. The vulnerability of the missiles is seen as an embarrassment for Russia.