The air-to-ground missile maneuvers near the South Korean coast were intentionally scheduled for North Korea's communist party's anniversary. In August, Pyongyang threatened to shoot intermediate range missiles towards the vicinity of Guam, a target frequently subjected to sabre-rattling from the North.
Rhee, now a member of the National Assembly's committee for national defence, said about 80 percent of the hacked data has not yet been identified, but that none of the information was expected to have compromised the South Korean military as it was not top classified intelligence.
The training was part of a programme of "extended deterrence" against North Korea, it added.
The briefing by his defence secretary James Mattis and top military officer General Joseph Dunford "focused on a range of options to respond to any form of North Korean aggression or, if necessary, to prevent North Korea from threatening the United States and its allies with nuclear weapons", according to a brief statement from the White House.
The Defense Ministry after an investigation said in May that North Korea was likely behind the hacking of the Defense Integrated Data Center in September a year ago, but had refused to confirm media speculation that the decapitation strike plan was compromised.
The bombers took off from the US Pacific territory of Guam, before entering South Korean airspace and conducting firing exercises over the East Sea and Yellow Sea, South Korea's military said.
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The drills were conducted not long after Lee broke the news about the alleged cyberattacks to reporters.
"There is an urgent need for the military to change and update parts that were stolen by North Korea", Lee said.
Trump has in recent days suggested that talking to North Korea was a "waste of time", but officials later clarified that he meant at this point in time.
Details of the alleged 2016 hack emerged as President Donald Trump continues to imply that diplomatic efforts to rein in North Korea's nuclear and missile programs through negotiations have proven to be ineffective. Other stolen data included contingency plans for South Korean special forces and information on military facilities and power plants, he said.
More recently, Seoul accused North Korea of having hacked, stolen and leaked sensitive military secrets and Seoul-Washington war plans.
There is no evidence that the attacks were successful, and cybersecurity experts believe that North Korea lacks the ability to disrupt the power grid.
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