Seoul, March 7: The influential sister of North Korean leader Kim Jong Un warned on Tuesday that her country is ready to take "quick, overwhelming action" against the United States and South Korea, as the two nations are expanding their regular military drills.

Kim Yo Jong's statement came a day after the US flew a nuclear-capable B-52 bomber to the Korean peninsula for a joint drill with South Korean warplanes. The US and South Korean militaries are also preparing to revive their largest field exercises later this month. North Korea Orders Girls Having The Same Name As Kim Jong Un's Daughter To Change Their Names, Imposes Ban on Use of Name 'Ju Ae': Report.

"We keep our eye on the restless military moves by the US forces and the South Korean puppet military and are always on standby to take appropriate, quick and overwhelming action at any time according to our judgment," Kim Yo Jong said in a statement carried by state media.

She did not elaborate on what action North Korea would take. But North Korea has often performed missile tests in response to US-South Korean military drills because it views them as an invasion rehearsal.

"The demonstrative military moves and all sorts of rhetoric by the US and South Korea, which go so extremely frantic as not to be overlooked, undoubtedly provide (North Korea) with conditions for being forced to do something to cope with them," she said. Kim Jong Un Presides Over North Korea's Military Parade, Brings Wife and Daughter at Big Event (See Pics).

Monday's flyover of the B-52 bomber was the latest in a series of US-South Korean aerial exercises involving powerful US aircraft. The US has deployed a long-range US B-1B bomber or multiple B-1Bs to the peninsula a few more times earlier this year. South Korea said those drills demonstrated the allies' ability to make a decisive response to potential North Korean aggressions.

Last Friday, the South Korean and US militaries announced they would conduct a computer-simulated command post training from March 13-23 and restore their largest springtime field exercises that were last held in 2018.

The allies had cancelled or scaled back some of their regular drills since 2018 to support now-dormant diplomacy with North Korea and guard against the COVID-19 pandemic. But they have been restoring their exercises after North Korea last year conducted a record number of missile tests and openly threatened to use its nuclear weapons in potential conflicts with its rivals.

In a separate statement on Tuesday, North Korea's foreign ministry called the flyover of the US B-52 bomber "a reckless military provocation" that it said pushes the situation on the peninsula "deeper into the bottomless quagmire".

An unidentified head of the ministry's foreign news office said the recent US military actions foretell "the gravity of the catastrophic tension that will be entailed by them".

"There is no guarantee that there will be no violent physical conflict in the Korean peninsula," if the US-South Korean military provocation continues, the official said.

North Korea often unleashes fiery rhetoric in times of heightened animosities with the US and South Korea. Possible steps North Korea could take include a nuclear test or the launch of a new type of intercontinental ballistic missile (ICBM) targeting the mainland US, observers say.

Last month, Kim Yo Jong threatened to turn the Pacific into the North's firing range. In her Tuesday statement, she said North Korea would consider a possible US attempt to intercept a North Korean ICBM a declaration of war. She cited a South Korean media report saying the US military plans to shoot down a North Korean ICBM if it is launched toward the Pacific.

All known North Korean ICBM tests have been made at steep angles to avoid neighbouring countries, and the weapons landed in the waters between the Korean peninsula and Japan.

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