At least 17 civilians have been killed in an air strike on a basement shelter in south-western Syria, activists say, as warplanes pound rebel-held areas. A monitoring group reported that five children were among those who died when aircraft identified as Russian bombed Musayfira, east of the city of Deraa. Russia is backing an army offensive in the region, which borders Jordan and the Israeli-occupied Golan Heights. More than 90 civilians are said to have been killed since it began 11 days ago. The provinces of Deraa and Quneitra had been relatively calm for almost a year because of a...