If confirmed, such a hack would be a major blow for South Korea at a time when its relations with North Korea are at a low point. Defense officials refused to comment Wednesday.
Rhee told CNN on Tuesday that the documents stolen included the South Korea-US wartime operational plan and a document that includes procedures to "decapitate" the North Korean leadership.
"Although I will not comment on intelligence matters or specific incidents related to cyber intrusion, I can assure you that we are confident in the security of our operations plans and our ability to deal with any threat from North Korea", Pentagon spokesman Colonel Robert Manning told reporters.
The bilateral training mission between the U.S. B-1B bombers and South Korean F-15K fighter jets on Tuesday night followed a September 23 mission in which USA bombers and fighter escorts used pre-dawn hours to fly to the farthest point of the border between North and South Korea by any US aircraft this century.
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This comes after US President Donald Trump last night discussed a "range of options" with his national security team to respond to North Korea's recent nuclear tests. Pyongyang belatedly responded by relocating some of its military aircraft to its east coast, the National Intelligence Service then said.
The B-1B Lancers, which flew from Andersen Air Force Base in Guam, were joined by South Korean fighter jets after entering the Korean Air Defense Identification Zone about 8:50 p.m. Tuesday, the South Korean military said. In a speech at the United Nations in September, the US President accused the North Korean leader Kim of being "on a suicide mission" - while Kim responded by vowing to "tame the mentally deranged US dotard with fire".
"There is an urgent need for the military to change and update parts that were stolen by North Korea", Lee said.
North Korea expert, Lim Eul-chul, said: "It may sound insane to outsiders to fire missiles from a place he wants to develop economically, but that's how Kim runs his country". He revealed that around 235 gigabytes of military documents had been stolen from the Defence Integrated Data Centre, and that 80% of them have yet to be identified.
During an address to the United Nations General Assembly in September, Mr Trump declared that the U.S. would "totally destroy North Korea" if forced to defend itself or its allies.
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