The long-anticipated congress, the first since 1980, nominated Kim for the top party post earlier.
On Friday, he hailed the country`s successful nuclear test and satellite launch, "boosting the country`s dignity and national power."
Tensions on the Korean Peninsula escalated after North Korea carried out a nuclear test - allegedly a hydrogen bomb test - in early January and put a satellite into orbit a month later which violated UN Security Council resolutions and triggered condemnation from the international community.
In March, the UN Security Council unanimously adopted Resolution 2270, which severely restricted Pyongyang`s engagement in commercial activities that could benefit its nuclear or missile programs.
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