Why is the red and black flag, seen at rallies in support of Ukraine, causing such a stir?

Is it a pro-Nazi banner or a harmless expression of Ukrainian patriotism? Russia's invasion of Ukraine has put a spotlight on a flag from the Second World War-era Ukrainian Insurgent Army that can be seen at pro-Ukraine rallies in Canada and elsewhere.
Is it a pro-Nazi banner or a harmless expression of Ukrainian patriotism? Russia's invasion of Ukraine has put a spotlight on a flag from the Second World War-era Ukrainian Insurgent Army that can be seen at pro-Ukraine rallies in Canada and elsewhere.

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Why is the red and black flag, seen at rallies in support of

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