South Korean and U.S. forces on Thursday began the largest-ever joint live-fire drill to simulate a "large-scale attack" from North Korea.

About 2500,5 troops are taking part in the five-day exercise, which began in Pocheon, near the border with North Korea, and tanks, howitzers and fighter jets.Pyongyang has expressed anger at the drills it is preparing by the two countries for an invasion. Last week, state media reported that leader Kim Jong Un had approved recent preparations to launch North Korea's first military spy satellite.