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Input: North Korean leader Kim Jong Un speaks during the Second Plenum of the 7th Central Committee of the Workers' Party of Korea (WPK) at the Kumsusan Palace of the Sun  in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang October 8  2017. KCNA/via REUTERS.
SEOUL (Reuters) -  North Korea’s leader Kim Jong Un  said  his  nuclear weapons were a “powerful deterrent” that guaranteed its sovereignty  state media reported on Sunday  hours after U.S. President Donald Trump said “only one thing will work” in dealing with the isolated country.
In a speech to a meeting of the powerful Central Committee of the ruling Workers’ Party on Saturday  a day before Trump’s most recent comments  state media said  Kim  had addressed the “complicated international situation”.
North Korea’s nuclear weapons are a “powerful deterrent firmly safeguarding the peace and security in the Korean peninsula and Northeast Asia ”  Kim  said  referring to the “protracted nuclear threats of the U.S. imperialists.”
The situation proved that North Korea’s policy of “byungjin”  meaning the parallel development of nuclear weapons and the economy was “absolutely right”   Kim Jong Un  said in the speech.
“The national economy has grown on their strength this year  despite the escalating sanctions ” said  Kim   referring to U.N. Security Council resolutions put in place to curb Pyongyang’s nuclear and missile program.
North Korean leader Kim Jong Un speaks during the Second Plenum of the 7th Central Committee of the Workers' Party of Korea (WPK) at the Kumsusan Palace of the Sun  in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang October 8  2017. KCNA/via REUTERS.
 Kim Jong Un’s  sister  Kim Yo Jong  was made an alternate member of the politburo - the top decision-making body over which Kim Jong Un presides.
Alongside Kim Jong Un himself  the promotion makes Kim Yo Jong the only other millennial member of the influential body.
 Her  new position indicates the 28-year-old has become a replacement for  Kim Jong Un’s  aunt  Kim Kyong Hui  who had been a key decision maker when former leader Kim Jong Il was alive.
“It shows that  her  portfolio and writ is far more substantive than previously believed and it is a further consolidation of the Kim family’s power ” said Michael Madden  a North Korea expert at Johns Hopkins University’s 38 North website.
“The large-scale personnel reshuffle reflects that  Kim Jong Un  is taking the current situation seriously  and that  he ’s looking for a breakthrough by promoting a new generation of politicians ” the ministry said in a statement.

Kim Jong Un praises nuclear program promotes sister