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North Korea says it has successfully tested an engine designed for an intercontinental ballistic missile.
The new type of engine would "guarantee" the ability to launch a nuclear strike on the US mainland, the KCNA news agency said.
The test was conducted at the country's long-range missile launch site near its west coast.
It is the latest in a series of tests and launches carried out by the isolated nation.
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Leader Kim Jong-un supervised the test, state media reported, during which "the engine spewed out huge flames with a deafening boom".
The country would now be able to "keep any cesspool of evils in the earth including the US mainland within our striking range," Mr Kim was quoted as saying.
North Korea should "refrain from actions and rhetoric that further destabilise the region and focus instead on taking concrete steps toward fulfilling its commitments and international obligations," said US State Department spokesman Mark Toner.
Analysis: Steve Evans, BBC, Seoul
Step-by-step, North Korea is completing the tasks needed to have a nuclear-tipped missile capable of striking the United States.
In recent weeks, it has said it's made the heat-resistant materials necessary. It broadcast pictures of Kim Jong-un looking on approvingly at what it claimed was a small nuclear warhead. Now, it says it has the necessary rocket engine.
It's impossible to verify the claims, though on Tuesday the South Korean government accepted that North Korea had made crucial advances.
Next month, there's a grand political congress in Pyongyang, to which Kim Jong-un is building up with fearsome rhetoric. He has threatened a fifth nuclear test. It would not be a surprise if that happened.
In March, North Korea said it had developed nuclear warheads small enough to fit on ballistic missiles.
However, experts cast doubt on the claims.
March also saw North Korea threaten "indiscriminate" nuclear strikes on the US and South Korea as they held big joint military drills, which the north sees as a rehearsal for an eventual invasion.