U.S. deploys anti-missile ships before N.Korea launch

The launch presents the first significant challenge by the prickly state to U.S. President Barack Obama, who makes his first major international appearance this week at the G-20 summit where he will discuss Pyongyang's intentions with global leaders including Chinese President Hu Jintao.

The United States, however, has no plans to shoot down the rocket in a test seen by Washington as part of Pyongyang's goal to eventually develop an intercontinental ballistic missile, U.S. Defense Secretary Robert Gates said on Sunday.