The meetings come as Pyongyang seeks to expand its diplomatic engagement after COVID-19 lockdowns.
Additional representatives from China and North Korea met in the same period of time.
N. Korea conducted a flight test of an intermediate-range hypersonic missile which it said at the time used a new solid-fuel engine and also tested the operation of a maneuverable warhead.
Kim Jong Un watches North-Korean war-like practice drills after the start of annual combined military drills by the Us and South Korea.
North Korea has shipped about 6,700 containers carrying millions of munitions to Russia since July to support its war against Ukraine
North Korea has said since last week that it had tested "strategic" cruise missiles, implying they may be designed to carry nuclear warheads.
In recent months, the North has tested an array of weapons that include ballistic missile systems that are under development and an underwater drone.
North Korea established the Artificial Intelligence Research Institute in 2013, and in recent years, several companies have promoted commercial products featuring AI.
The students were sentenced, according to the video, after being convicted of watching and spreading South Korean movies, music and music videos over three months.
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