U.S.-led coalition aircraft unleashed a series of strikes targeting the Islamic State group’s stronghold of Raqqa in eastern Syria in what the coalition said Sunday was one of its most sustained aerial operations carried out in Syria to date. U.S. Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif were locked in negotiations Sunday in Vienna with just two days left before their latest deadline for a comprehensive nuclear pact. World powers and Iran are hoping to clinch a deal by Tuesday, setting a decade of restrictions on Iran’s nuclear program and granting Iran relief from international sanctions. Five Ukrainian soldiers were killed and three wounded when a land mine exploded in the east of the country, where government troops are fighting Russia-backed separatists. Hundreds of fans flocked to Queen Elizabeth II’s country estate in Sandringham on Sunday, hoping to catch a glimpse of Britain’s royal family as they gathered for Princess Charlotte’s christening. Like her elder brother George, Charlotte was christened in a replica of the intricate lace-and-satin christening gown made for Queen Victoria’s eldest daughter, also named Victoria, in 1841. [...] 2008, that original gown had been worn by all royal babies — including the queen — at their baptism.