China called on Russia today to explain how a Chinese cargo ship sank in Russian waters after reports it was fired on by the Russian military, according to Reuters. Seven Chinese sailors were missing after the "New Star" sank on last Saturday in stormy seas off Vladivostok and after a Russian warship shot at least 500 rounds into it, the official China Daily newspaper said, quoting a Chinese-language paper which in turn quoted a Russian newspaper. "China has already made representations to the Russian side," Chinese Foreign Ministry spokeswoman Jiang Yu told a news conference. "We hope they continue with the search and rescue operations for the missing sailors and clarify the reason (for the incident) as soon as possible."