North Korea's nuclear weapons capabilities and ballistic missile defense programs constitute a "serious threat" to the United States, Defense Secretary Ash Carter said on Sunday. The United States is prepared to shoot down a North Korean missile launch or test "if it were coming towards our territory or the territory of our friends and allies," Carter said during an appearance on NBC's "Meet the Press." North Korea declared on Sunday it can test-launch an intercontinental ballistic missile at any time from any location set by leader Kim Jong Un, saying a hostile U.S. policy is to blame for its arms development.

Kim said on Jan. 1 that his nuclear-capable country was close to test-launching an intercontinental ballistic missile (ICBM). "The ICBM will be launched anytime and anywhere determined by the supreme headquarters of the DPRK," an unnamed Foreign Ministry spokesman was quoted as saying by the official KCNA news agency, using the acronym for the country's name. The North is formally known as the Democratic People's Republic of Korea. The United States said on Jan. 5 that North Korea had demonstrated a "qualitative" improvement in its nuclear and missile capabilities after an unprecedented level of tests last year. North Korea has been testing rocket engines and heat-shields for an ICBM while developing the technology to guide a missile after re-entry into the atmosphere following a lift-off, experts have said. While Pyongyang is close to a test, it is likely to take some years to perfect the weapon, according to the experts.