Washington and Seoul have ramped up defence cooperation in the face of growing threats from the North, which has conducted a series of banned weapons tests in recent months.
"NorthKorea will use the Freedom Shield 2023 Exercise to unify its people and as an excuse to further invest in weapons of mass destruction," said Chun In-bum, a retired South Korean army general.
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"More missile launches with variations in style and scope should be expected with even a nuclear test. More acts of intimidation from North Korea should not come as a surprise."
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But Hong Min of the Korea Institute for National Unification said Pyongyang was not expected to "cross the red line".
The North is likely to refrain from activities "at which the US and South Korea are forced to counter strike in response", he said.