Hydrogen bomb test: Know who is Kim Jong-un

North Korea made a major announcement claiming that they successfully tested a miniaturised hydrogen bomb. The announcement followed after South Korean officials detected an "artificial earthquake" near North Korea's main nuclear testing site.

The move has triggered global anxiety and concern among neighbours and other nations.

The US, Japan and South Korea have decided to launch a united and strong international response to North Korea's claim of a successful hydrogen bomb test.

US President Barack Obama made separate phone calls to his South Korean counterpart Park Geun-Hye and Japanese Prime Minister Shinzo Abe to discuss with them security situation in the region following North Korea's test.

Here are some facts to know about the dictator Kim Jong-un

• Kim Jong-un the supreme commander of North Korea or Democratic People's Republic of Korea (DPRK).

• He was earlier known as Kim Jong-woon or Kim Jung-woon.

• His birth year was kept secret, although rumour has it that he was born in 1984.

• He was named head of the party, state and army in 2011 after the death of his father Kim Jong-il. His father died on December 17.

• He made his first public speech as North Korea marked the 100th anniversary of the birthday of Kim Il-sung on 15 April 2012.

• It was in 2012 when he was anointed as marshal - the highest military rank in North Korea.

• Before testing hydrogen bomb on Jan 6, North Korea under his leadership carried nuclear test.

• Kim Jong-un was his father's favourite.

• Previously, his most high-profile act had been to purge and execute his uncle, Chang Song-thaek, who state media said had been plotting a coup, in December 2013.

• He executed his uncle Jang Song-thaek, his entire family in December 2013.

• Up to 70 top officials - army generals, cabinet ministers, party secretaries and the like - have been executed since he assumed office.

• The strange haircut, eccentric clothing, and penchant for purging top officials and generals has made him the object of ridicule in the world media.