Seoul, South Korea - North Korean state media on Wednesday slammed joint military drills by the US and South Korea as a "most immediate and open threat," while not mentioning President Donald Trump's order to curtail the exercises.

Further, joint military drills between South Korea and the US will end on Friday, not August 27 as originally scheduled, Seoul's military announced.

"We have decided to adjust the UFS exercise period to run from the 17th to the 21st," South Korea's Joint Chiefs of Staff said in a statement on Wednesday.

Trump on Sunday stunned allies in the region by ordering the Pentagon to scale back the annual Ulchi Freedom Shield exercises, just a day before they were to get underway.

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He called the drills "inappropriate and hostile", while praising North Korean leader Kim Jong Un and criticizing Seoul for not supporting his war against Iran.

The nuclear-armed North has long voiced outrage at the drills, considering them dress rehearsals for an invasion.

A commentary by the state-run Korean Central News Agency (KCNA) repeated that position, saying the "drill poses the most immediate and open threat" to North Korea and "regional security".

The commentary was titled: "We Will Exercise Our Right to Self-defence for Neutralizing Military Threat from Hostile Forces through More Transparent Action."

It did not mention Trump's order at all, nor the US president's stated desire to resume talks with Kim.

Trump on Monday said Kim had responded to his overtures, but did not provide details.

The US stations about 28,500 troops in South Korea to bolster the country's defenses, a legacy of the 1950-53 Korean War that ended with an armistice rather than a peace treaty.