The historical precedent for the supply of weapons to armies opposing one of the great powers was set almost immediately within the cold war. It was done a bit more subtly than today, but I think it's the subtlety that has died and not the intent.
The last thing anyone reasonable on earth should want is a nuclear war, which is what a war between Russia and the USA would become, probably pretty quickly. Especially the people of Ukraine, which almost certainly would feel the first nuclear weapon in that conflict.
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