U.S. Navy ships capable of shooting down ballistic missiles have also been moved to the Sea of Japan , a Navy spokesman said . North Korea says it will attack Japanese military , ` ` major targets , '' if it shoots down rocket . Japan recently mobilized its air defense system in response to planned launch . N. Korea says it would likely launch between April 4 and April 8 . Sources say ` ` bulbous '' shape atop rocket could indicate satellite aboard .
North Korea says it will attack Japanese military , ` ` major targets , '' if it shoots down rocket . Japan recently mobilized its air defense system in response to planned launch . N. Korea says it would likely launch between April 4 and April 8 . Sources say ` ` bulbous '' shape atop rocket could indicate satellite aboard .