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It is a mutual understanding.

Improvised clubs with embedded nails, rebar and wooden bats ala Mad Max style. Both are nuclear armed nations, so it is sort of de-escalation mechanism for saving face whenever they clash without somebody taking it up a notch.

They have a working agreement that allows no weapons within two kilometers of the demarcation line. Hence the medieval weapons.

That's to add one additional rung to the escalation ladder. It's a good thing.