It makes sense that North Korea would be looking to upgrade their air defenses considering the strategic bombing threat they face if conflict was to happen on the peninsula:

The chief of the U.S. Indo-Pacific Command reportedly said North Korea provided ballistic missiles and artillery shells to support Russia’s war in Ukraine and will receive advanced air defense equipment in return.
According to Ukraine’s daily Kyiv Post on Monday, Adm. Samuel Paparo conveyed the information during a briefing for the U.S. Senate Armed Services Committee on Thursday.
Paparo reportedly said North Korea has sent hundreds of short-range ballistic missiles and hundreds of thousands of artillery shells to support Russia’s war and that in return, it will receive advanced air defense equipment, including surface-to-air missile systems and other technology.
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