A North Korean submarine launched a ballistic missile off the coast of Sinpo early Wednesday local time, the Pentagon confirmed late Tuesday.

The presumed KN-11 missile covered 300 miles before landing in the Sea of Japan, U.S. Strategic Command confirmed. The North American Aerospace Defense Command said the launch did not pose a threat to the U.S., but Defense officials will continue to monitor the communist country.

"The men and women of USSTRATCOM, NORAD and U.S. Northern Command, and U.S. Pacific Command remain vigilant in the face of North Korean provocations and are fully committed to working closely with our Republic of Korea and Japanese allies to maintain security," Gary Ross, U.S. Navy commander, said in a statement.

North Korea has tested more than half a dozen ballistic missiles since the beginning of the year, despite a United Nations' Security Council resolution to halt all nuclear-related tests.

North Korea, controlled by leader Kim Jong Un, has previously threatened nuclear attacks against Seoul, South Korea, Washington, D.C., and Manhattan.

The U.N. Security Council has imposed sanctions on the defiant country, in part to keep it from importing any materials that could be used for nuclear projects.