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Timeline: Kim Jong Un's Rise to Power

Kim Jong Un's Rise to Power

September 2010: Promoted to four-star general by his father, Kim Jong Il

December 2011: Kim Jong Il dies of a heart attack, leaving power to relatively inexperienced Kim Jong Un

February 2012: North Korea makes nuclear concessions in exchange for badly needed food aid from U.S.

April 2012: North Korea tries unsucessfully to launch rocket, leading U.S. to cancel food aid deal

May 2012: Pyongyang vows to continue developing its nuclear program, amid concerns it could conduct a third nuclear test

July 2012: Army chief Ri Yong Ho unexpectedly removed from his post because of undisclosed "illness," replaced by obscure general

July 2012: Formally declared head of North Korea's 1.2 million-strong military, effectively completing his succession to power