South Korea and United States have launched Vigilant Ace 18, their largest-ever joint aerial drills.
The exercise comes after North Korea tested Hwasong-15, its most advanced and powerful Inter Continental Ballistic Missile (ICBM) as part of its weapons programme.
Monday's Vigilant Ace exercis'es, due to last five days, will involve more than 230 warplanes and 12,000 soldiers from both sides.
The drill lasts from today until December 8 over eight air bases across the Korean Peninsula.
Trump's troops will be using the hi-tech F-35 Lightning IIs and F-22 Raptors.
Both fighter jets are said to be stronger than North Korea's arsenal.
F-35s can fly at speeds of 1,931km/h and are capable of carrying nuclear bombs and bunker busters.
Meanwhile, the F-22 can hit speeds of up to 2414km/h and are armed with Vulcan miniguns and Sidewinder missiles.
