Silence of Russian S-300 and S-400 systems in Syria prevented nuclear war After the United States struck a missile blow on Shayrat airfield in Syria's Homs, many wondered why Russian sophisticated air defence systems, such as Pantsir, S-300, S-400, Buk-M2 and Tor complexes, have not protected Syria from 59 Tomahawk cruise missiles launched by Ross and Porter destroyers. Predictably, Russian libera