The annual exercises were scheduled to go for 10 days starting on August 21 with 25,000 US troops involved.
Pyongyang had earlier threatened to fire a salvo of Hwasong-12s toward Guam, which is home to key USA military bases and strategic long-range bombers the North finds threatening, and flight tested a pair of developmental ICBMs in July. Two U.S. B-1B supersonic bombers and four F-35B stealth fighter jets joined four South Korean F-15 fighters in live-fire exercises at a military field in eastern South Korea that simulated precision strikes against the North's "core facilities", according to the U.S. Pacific Command and South Korea's Defense Ministry. North Korea has made it clear that it sees its weapons program, which demands regular testing to flawless, as the only way to contest decades of US hostility, by which it means the huge USA military presence in South Korea, Japan and the Pacific. Three short-range missiles were launched on Saturday.
May, who is now conducting a state visit to Japan, released a joint statement with Abe in response to the August 29 launch of a Hwasong-12 intermediate range ballistic missile, which flew over Japanese territory and landed in the Pacific Ocean east of the city of Hokkaido.
The air drills involved two supersonic US B-1B bombers and four United States health F-35B jets alongside South Korean and Japanese fighter jets.
"As we leave the EU, we will work to quickly establish a new economic partnership between the United Kingdom and Japan based on the terms of the Japan-EU Economic Partnership Agreement", May will say according to advanced extracts of her speech. In Beijing, North Korea's ally China warned that war is not an option in finding a solution to the North's growing nuclear capabilities.
The test, using Standard Missile-6 guided missiles, intercepted a medium-range ballistic missile target.
Fears about North Korea's missile and nuclear threats have intensified this week after Pyongyang's latest test launch crossed northern Japan.
North Korea has been flagrantly displaying its progress on its quest to develop weapons systems capable of launching a nuclear-tipped missile capable of hitting the USA, and has recently threatened Guam, a USA territory. Both times North Korea said the projectiles were carrying satellites.
The incident was announced by South Korean officials who say the missile was launched from Sunan, near North Korea's capital, Pyongyang.