moscow russian prime minister dmitry medvedev complain friday u.s. cruise missile strike syrian airbase one step away clash russian military u.s. officials inform russian force ahead strike intend punish syrian government say chemical weapons attack early week avoid hit russian personnel satellite imagery suggest shayrat air base strike home russian special force military helicopters part kremlin effort help syrian government fight islamic state militant group medvedev write social media say u.s. strike illegal one step away military clash russia russian pm say u.s. syria strike 'one step away clash russia