During Tuesday's drills, the USA bombers, which flew from the Andersen Air Force Base in Guam, staged simulated air-to-ground missile striking drills off the peninsula's east coast before flying across the country accompanied by the two South Korean fighters.
After entering South Korean airspace, the two bombers carried out air-to-ground missile drills in waters off the east coast of South Korea, then flew over the South to waters between it and China to repeat the drill, the release said.
A spokesman for North Korea's foreign ministry said last month that the more sanctions the USA and its allies impose on North Korea, the faster the nation will work to develop its nuclear weapons programme, according to North Korea's official KCNA news agency.
A statement from FireEye said: "North Korea linked hackers are among the most prolific nation-state threats, targeting not only the US and South Korea but the global financial system and nations worldwide".
Meanwhile this information emerged around the same time the U.S. military flew two strategic bombers over the Korean peninsula in a show of force late on Tuesday.
North Korea's "strategic forces, possessing inexhaustible strength not yet known to anyone, will not let America, an aggressor state, go unpunished", Ri continued.
US and South Korean wartime operational plans, including a plan to wipe out the North Korean leadership, were stolen by North Korean hackers past year, a South Korean ruling party lawmaker said on Wednesday.
In a surprising sign of weakness, the commentary also says that if North Atlantic Treaty Organisation would join the United States in the Korean Peninsula it would "change the balance of forces" against it.
Trump hosted a discussion on Tuesday on options to respond to any North Korean aggression or, if necessary, to prevent Pyongyang from threatening the United States and its allies with nuclear weapons, the White House said in a statement.
A ministry spokesman declined to confirm the report, citing intelligence matters.
However it is unlikely North Korea would agree to allow the business owners' request to visit their facilities, given the heightened tensions over Pyongyang's nuclear and missile programs.
The speech came about a week after the UN Security Council had voted to ratchet up sanctions on North Korea following its sixth and largest nuclear test.
It was the first time US Pacific Command B-1B Lancers have conducted combined training with Japanese and South Korean fighter aircraft at night, the US military said in a statement.
South Korea's spy agency told lawmakers after the September 23 mission that North Korea failed to detect the B-1B bombers as they flew in worldwide airspace east of the country. North Korea needs time and proof to believe that abandoning its nuclear programme will contribute to its own political and economic advantage. North Korea's possession of secret war plans would require a major overhaul of how South Korea and its ally Washington would respond if there's another war on the Korean Peninsula.
Speaking during a parliamentary audit Thursday, Foreign Minister Kang Kyung-wha said, "We will beef up our leading role to generate an environment in which denuclearization talks can resume".