The United States will in the coming days ask a UN Security Council committee to impose sanctions on seven ships suspected of violating UN sanctions on North Korea, a State Department official said on Monday.The seven vessels have illegally exported North Korean coal and iron ore to China, which traditionally earns Pyongyang between US$200 million and US$400 million a year, said the US official, speaking on condition of anonymity.“These nominations are not just bureaucratic exercises. They’re...