The statement from state media came a day after South Korea's military reported that it believed North Korea had fired a submarine-launched ballistic missile (SLBM) off its east coast, the latest in a string of North Korean missile tests.
The White House urged North Korea to refrain from further "provocations", with spokeswoman Jen Psaki saying on Tuesday the United States remained open to engaging diplomatically with North Korea over its weapons programmes.
Pyongyang so far has rejected those overtures, accusing the United States and South Korea of talking diplomacy while ratcheting up tensions with their own military activities.
South Korean Foreign Minister Chung Eui-yong on Wednesday called for Washington to ease sanctions if the North returns to talks.
"Action must be taken as soon as possible to stop North Korea from further developing nuclear and missile capability," he told parliament. "I think considering relaxing sanctions can surely be an option."
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