"There's been no talk of reducing anything. There's been no talk of changing our scope," Pentagon spokeswoman Dana White said.
The exercises "are defensive in nature and the scope hasn't changed ... This is about safeguarding the alliance," she added.
North Korea has canceled talks with Seoul over the "Max Thunder" joint military exercises between the US and the South.
Pyongyang has also threatened to cancel a historic summit between US President Donald Trump and North Korean leader Kim Jong Un in Singapore next month, following weeks of tentative rapprochement.
The Max Thunder drills started May 11 and involve some 100 aircraft from the US and South Korea, including F-22 stealth fighter jets.
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![Ukrainian President, Volodymyr Zelensky and US President Joe Biden [BBC]](data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20width%3D'300'%20height%3D'172'%20data-ring-placeholder%3D'1'%3E%3C%2Fsvg%3E "Ukrainian President, Volodymyr Zelensky and US President Joe Biden [BBC]")
