F-16 and A-10 aircraft were being relocated from Osan Air Base to the South Korean base at Gwangju "due to adverse weather conditions", while the F-35s and F-16s were moved to Gwangju due to a runway problem at Kunsan, the 7th Air Force public affairs office said in an email.
These waters comprise China's "air defense identification zone", where China has flown numerous military exercises since 2011 - often during moments of tension with Japan and South Korea, as the zone includes waters claimed by either nation.
The runway at Kunsan was closed temporarily after an F-16C assigned to the 8th Fighter Wing "experienced a ground emergency affecting the integrity of its landing gear" while taxiing, Capt. Chris Mesnard, a spokesman for the fighter wing, said separately.
On Wednesday, the USA showcased its immensely powerful four B-1B Lancer strategic bombers and six F-22 Raptor stealth fighter jets with a series of exercises alongside South Korean armory which began at the Pilsung Firing Range.
The sheer size of the US-South Korea exercise, as well as the continuous American military buildup in the peninsula since the spring, may be taken by Beijing as indication that the US plans to do exactly that.
Some 1,000 marines from Russia's Pacific Fleet have been conducting a live-fire drill with tanks in in Siberia, including the border areas with North Korea, Newsweek reported Monday quoting a statement from the Russian Defense Ministry.
The United States and South Korea deployed THAAD, a US missile defense system, that is strongly opposed in Beijing.
Though Chinese military officials will likely claim that the new drills are not in direct response to USA and South Korean actions, military experts agree that this show of force warns against the continued provocation of North Korea.
On Wednesday, a B-1B bomber was joined by F-22 and F-35 stealth fighters for what South Korea's joint chiefs of staff referred to as simulated strikes at a military field. Is war with North Korea inevitable now?
"If necessary, the president and the United States will have to take care of it, because he has said he's not going to allow this murderous, rogue regime to threaten the United States with the-with the most-destructive weapons on the planet".
"The South-North Korean relations are still not so good".
"Should the USA miscalculate our patience and light the fuse for a nuclear war, we will surely make the USA dearly pay the consequences with our mighty nuclear force which we have consistently strengthened".
The Chinese Ministry of Foreign Affairs on Wednesday expressed concerns over the continued deployment of US strategic assets. Feltman held talks with deputy foreign minister Pak Myong Gun on Wednesday.