While the exercise comes on the heels of North Korea's missile test, the timing of the wargames is purely coincidence.
The Chinese air force launched an exercise of their own concurrent to the enormous air drills being run by the United States and South Korea, causing experts to speculate what, exactly, Beijing is trying to communicate to the West.
The supersonic jet departed from its base in the US territory of Guam before joining two Japanese F-15 fighters and then took part in military drills on the Korean Peninsula along with Americans and South Korean fighter jets, Bloomberg reported.
The South Korean army's adoption of drones on the battlefield follows the footsteps of the US and Chinese armed forces, which have already adopted swarming drone tactics.
The United States and South Korea deployed THAAD, a US missile defense system, that is strongly opposed in Beijing.
U.S. B-1B Lancer bombers will fly over the Korean peninsula on Wednesday as part of a large-scale joint aerial drill being staged with South Korea this week, the South's Yonhap news agency reported, citing an unidentified military source.
"The threat here on the peninsula is very real, and countering that threat needs to be in the forefront of our minds", 51st Fighter Wing Commander Col. William Betts said in a release. "We will ensure we have no regrets if we find ourselves executing contingency operations".
The Chinese Ministry of Foreign Affairs on Wednesday expressed concerns over the continued deployment of US strategic assets.
The threats come a week after North Korea's latest launch of an ICBM, which is believed to be capable of striking anywhere in the US mainland.
According to a source close the army on Tuesday, a new group will be formed in the military dedicated to the development of drone bots and standard platforms, as well as creating a team of drone bot combatants, which will be a "game changer" on the battlefield.
North Korea's state media confirmed the arrival of Feltman and his entourage late on Tuesday without offering more details.
"The South-North Korean relations are still not so good. Its intentions are to use that weapon for nuclear blackmail, and then, to, quote, you know, "reunify" the peninsula under the red banner".
China and Russian Federation had proposed that the United States and South Korea stop major military exercises in exchange for North Korea halting its weapons programmes.
Officials in Pyongyang have described the exercises as the US president "begging for a nuclear war".
The U.S. -South Korea drills coincide with a rare visit to the isolated North by United Nations political affairs chief Jeffrey Feltman.