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I am assuming it means ammo that fits the ukrainian weapons, it could be ammo specially produced for arty that the west don't have.I wonder what that non standard ammunition the US are considering selling to Ukraine is.
I would assume non standard would be something speciality, such as depleted uranium, outside that its hard to think what would be classified as non standard.... do they do 155mm tactical nuke rounds?
There is no way it's nuclear that would be insane, it's not going to be thermobaric either because they are also banned.
The West can't be seen to getting in the gutter with Russia.