North Korea is said to have deployed an intermediate-range missile to Wonsan, Gangwon Province on Tuesday.
 
The Joint Chiefs of Staff said that it is closely monitoring the North for possible missile launches.
 
A military official said that such preparation follows four failed test-firings of Musudan intermediate-range missiles in April and May.
 
The military is said to believe that the North will launch a Musudan missile as early as Tuesday or Wednesday.
 
First deployed in 2007, the Musudan missile has a range of more than three-thousand kilometers. It is believed that the missile is capable of striking the whole of Japan as well as the Pacific island of Guam, which houses U.S. military bases.