The Pentagon also declined to comment specifically on reports of the potential breach, but spokesman Col. Robert Manning said on Tuesday that the U.S. is "confident in the security of our operations plans and our ability to deal with any threat from North Korea".
The exercises came hours after a South Korean lawmaker claimed North Korean hackers had stolen a large cache of military documents from his country, "including a plan to assassinate North Korea's leader Kim Jong Un, and wartime contingency plans drawn up by the US and South Korea", reports the BBC. Two days previous to that comment the president said on the social media platform that Pyongyang had violated agreements "before the ink was dry, making fools of USA negotiators".
The South has taken an increasingly aggressive stance toward the North's belligerence amid back-and-forth threats of war between North Korea and U.S. President Donald Trump. "And I can tell you who is going to win".
Democratic Party representative Rhee Cheol-hee said in radio appearances yesterday that 235 gigabytes of military documents were taken from the Defense Integrated Data Center in September past year, citing information from unnamed South Korean defence officials. It involved a pair of B-1B Lancers staging a simulated air-to-ground missile firing with two South Korean F-15K jets over the Sea of Japan which then flew across the southern portion of the Korean peninsula.
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The coach said the hard work was starting to pay off for the team: "The players are enjoying playing for the Springboks", he said. The All Blacks, ranked one in the world, won the Rugby Championship with 28 from a possible 30 points.
It said the USA warplanes flew with fighter jets from the South Korean air force and Japan Self-Defense Force in the first nighttime B-1 bomber exercise between the three allies.
The drills were conducted not long after Lee broke the news about the alleged cyberattacks to reporters.
Among the classified plans allegedly stolen from the South were said to be blueprints for targeted attacks by Seoul and Washington to eliminate North Korean leader Kim Jong Un if a crisis breaks out or appears imminent. Given that set of circumstances, the Kim regime would likely chose to use its nuclear weapons.
The South's Yonhap news agency quoted Lee as saying that 235 gigabytes of military documents were taken.
North Korea watchers have been on alert for a possible provocation by the communist state in the days surrounding a key holiday Tuesday to mark the founding anniversary of its ruling party.