The drill comes a day after Pyongyang 'successfully tested' a Hydrogen Bomb, triggering chaos and tensions among its neighbours.

Seoul's exercise involved fighter jets and missiles.

Meanwhile, North Korea's reckless missile tests have prompted the UN Security Council to hold an emergency meeting later today.

North Korea has defied sanctions repeatedly and has riled its neighbours with umpteen nuclear tests.

The country has also claimed that it has successfully managed to miniaturise a nuclear weapon that can be loaded on to a missile.

The development looks ominous as the reclusive nation has already threatened the US.

Even though many, including the American President Donald Trump, speculates the gravity of the threat, US intelligence have told the Washington Post that North Korea has progressed at a much faster rate than expected and is capable of striking the US. 

According to a BBC report, both South Korean and Japanese leaders have urged tougher measures on Pyongyang.

The UN has already curbed North Korean exports through a sanction last month, crossing the country's leadership, who has hold America responsible for the development.

North Korea's Hydrogen Bomb test also triggered a scare in mainland China as Beijing has started an emergency probe into 'possible radiation leaks' following the test.

China has already issued a level-2 threat, the second highest grade on a four-point grading system.

Image: yonhapnews.co.kr