Link: http://www.reuters.com/article/worldNews/idUSTRE52T0F820090330

The United States deployed two missile-interceptor ships from South Korea on Monday, a military spokesman said, days ahead of a North Korean rocket launch widely seen as a long-range missile test that violates U.N. sanctions. The launch presents the first significant challenge by the prickly state to U.S. President Barack Obama, who will discuss Pyongyang's intentions with global leaders including Chinese President Hu Jintao this week at the G20 summit in London.