Syrians living in rebel-held areas of Homs province have seen a lot of destruction in four years of war, but say the Russian air force unleashed a whole new level of devastation in air strikes on their towns on Wednesday. Jets flying at higher altitudes than the Syrian air force emitted no noise to alert the people below to raids reported to have killed at least 33 civilians, including children. "We have been exposed to a wide range of weapons over the last five years, but what happened today was absolutely the most violent and ferocious, and the most comprehensive...