PYONGYANG, North Korea (AP) -- North Korea announced Saturday that Kim Jong Un has been officially named supreme commander of the military, further strengthening his authority after the death of his father, longtime North Korean leader Kim Jong Il.
Officials and state media have bestowed on Kim Jong Un, who is in his late 20s, a string of titles as North Korea's elite rally around him in the wake of his father's death this month after 17 years in power.
But the title Supreme Commander -- and its formal proclamation by the powerful Political Bureau of the Central Committee of the Workers' Party -- is a clear sign that Kim Jong Un is fast consolidating power over North Korea. It's also the latest step in a burgeoning personality cult around him.
Kim Jong Un should be "the only center of unity, cohesion and leadership" of the Workers' Party, North Korea's state media said, and the 1.2 million-strong military should uphold the "songun," or military-first, politics laid down by Kim Jong Il.
The party said the country should unite around Kim Jong Un and strengthen "the monolithic leadership system of Kim Jong Un in the whole party and society."
An unannounced Workers' Party meeting Friday proclaimed that the younger Kim "assumed supreme commandership of the Korean People's Army" according to a will made by Kim Jong Il on Oct. 8, the North's official Korean Central News Agency said in a statement early Saturday morning.
The meeting of the North's ruling party came one day after the official mourning period for Kim Jong Il ended and senior military and political officials publicly declared Kim Jong Un leader of the party, military and people at a memorial for his father attended by hundreds of thousands.
Titles are an important part of North Korea's efforts to link Kim Jong Un to the myth-building surrounding the Kim family legacy.
Kim Il Sung, the country's first and only president, retains the title Eternal President even after his death.
Kim Jong Il held three main positions: chairman of the National Defense Commission, general secretary of the Workers' Party and supreme commander of the Korean People's Army. According to the constitution, his position as chairman of the National Defense Commission made him Supreme Leader of North Korea.
Kim Jong Un was made a four-star general last year and appointed a vice chairman of the Central Military Commission of the Workers' Party. Since his father's death, he has wracked up major titles from officials and state media: Great Successor, Supreme Leader and Great Leader earlier Friday. And now he has officially been named Supreme Commander.
The North has made great efforts to show the world a unified face, but Kim Jong Un's age and inexperience have raised questions outside North Korea about his leadership of a nation engaged in delicate negotiations over its nuclear program and grappling with decades of economic hardship and chronic food shortages.
The North warned Friday that there would be no softening of its position toward South Korea's government.
North Korea's powerful National Defense Commission said the country would never deal with South Korean President Lee Myung-bak, a conservative who ended a no-strings-attached aid policy toward the North in 2008.
"We declare solemnly and confidently that the foolish politicians around the world, including the puppet group in South Korea, should not expect any change from us," the National Defense Commission said.
The commission said the "evil misdeeds" of the Lee administration reached a peak when it prevented South Koreans from visiting North Korea to pay respects to Kim Jong Il, except for two delegations led by a former first lady and a business leader, both of whose husbands had ties to North Korea.
North Korea had said foreign official delegations would not be allowed at the funeral but that it would welcome any South Koreans who wanted to travel to pay respects to Kim.
"Even though we lost Kim Jong Il, we have the dear respected Kim Jong Un," Kang Chol Bok, a 28-year-old officer of the Korean People's Internal Security Forces, told The Associated Press. "We will turn our profound sorrow into strength and courage."
Koh Yu-hwan, a North Korea expert at Seoul's Dongguk University, said the North is warning Seoul in the National Defense Commission statement not to take the new leadership lightly. He added that it's "too early to say the North is dashing hopes for reforms."
Associated Press writers Foster Klug, Scott McDonald and Sam Kim in Seoul, South Korea, contributed to this report. Follow AP's North Korea coverage at twitter.com/APklug and twitter.com/samkim_ap.