Pyongyang has warned of an "unimaginable strike at an unimaginable time" on US targets, expressing outrage at the ongoing US-South Korean joint naval drills near the Korean Peninsula.
The U.S. aircraft carrier Ronald Reagan, now conducting a four-day joint exercise with the South Korean navy off the Korean Peninsula, could be joined by another carrier in the coming weeks.
"The US is running amok by introducing under our nose the targets we have set as primary ones", North Korea's state news agency said in a statement. "They must understand that faced with an incredible strike at a unexpected time", - said in a statement.
McMaster said Trump won't allow North Korean to have nuclear weapons and denuclearisation is the only acceptable objective.
The US Navy's biggest warship in Asia, with a crew of 5,000 sailors, sailed around 100 miles, launching nearly 90 F-18 Super Hornets from its deck, in sight of South Korean islands.
It added that Americans should expect an "unimaginable strike at an unimaginable time".
The high-stakes war of words comes after North Korea conducted a series of intercontinental ballistic missile and nuclear tests to display its progress toward developing a nuclear missile capable of striking the U.S.
It is conducting drills with the South Korean navy involving 40 warships deployed in a line stretching from the Yellow Sea west of the peninsula into the Sea of Japan.
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Pyongyang habitually condemns such joint exercises and the state-run KCNA news agency on Saturday called the Ronald Reagan's participation a "reckless act of war maniacs as it only drives the tense situation on the peninsula into the point of explosion". The most stringent include a ban on coal, iron ore and seafood exports that aim at halting a third of North Korea's $3 billion of annual exports.
"North Korea best not make any more threats to the United States", he said.
The Reagan's presence in the region, coupled with recent military pressure by Washington on Pyongyang, including B1-B strategic bomber flights over the Korean peninsula, comes ahead of President Donald Trump's first official visit to Asia, set to start in Japan on November 5, with South Korea to follow.
North Korea's deputy ambassador to the United Nations Kim In Ryong made those comments Monday in a statement to the U.N. General Assembly meeting on nuclear disarmament.
Trump has threatened to "totally destroy" North Korea if the USA or its allies come under attack.
But while North Korea's verbal threats seem to be escalating, there's been a noticeable lull in its missile activity.
While tourists are free to visit the secretive state as part of strictly controlled tour groups, they are told to never take photos of soldiers by their handlers.
A Russian who returned from a visit to Pyongyang has said the regime is preparing to test a missile it believes can reach the U.S. west coast.