South Korea on Friday called on Russia to halt its arms deal with North Korea following a White House announcement that North Korean ballistic missiles were used in Russian attacks against Ukraine. A senior official of the Ministry of Foreign Affairs in Seoul said on this day that by hauling arms from North Korea, Russia was “contradicting” the United Nations Security Council resolutions despite being a p...
Russia is still under sanctions, so it’s probably trading stuff it has to spare - food, fertilizer, and oil/gas, meaning this is something that’s beneficial for them.
North Korea is probably handing over some of their older weapons (so they don’t have to maintain or dispose of them) as well as some of their newer weapons so that they can get feedback on how those weapons perform in real life combat, so this is something that is wish beneficial for them.
Since Russia and North Korea share a border, this trade seems almost inevitable.