This Freedom Shield training is the first since that happened, meaning it "will be very different -- both qualitatively and quantitatively -- from previous joint exercises that took place in recent years", he added.
North Korea, which recently called for an "exponential" increase in weapons production, including tactical nukes, had been widely expected to respond with missile launches and drills of its own -- with experts saying more were likely over the course of the US-South Korean exercises.
"North Korea 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.