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.

Putin Blames Poland for World War II - The Atlantic

Mouse Eat GIF Mouse Eat Cheese Discover Share GIFs

country with red and black flag - OFF-55% > Shipping free

Lawyers, a factory worker among the ordinary Ukrainians holding the line against Russia at Izyum

Ukraine: Conflict at the Crossroads of Europe and Russia

Revolution of Dignity - Wikipedia

What is the red and black flag in Ukraine? - Quora

Kyiv' or 'Kiev' — Here's why the difference is political

Bendera Kanada Di Konvoi Bantahan Menimbulkan Emosi Bangga, Kemarahan - Berita - Bendera Johnin

What does the flying of these flags together signify? : r/vexillology

country with red and black flag - OFF-55% > Shipping free

country with red and black flag - OFF-55% > Shipping free

Lawyers, a factory worker among the ordinary Ukrainians holding the line against Russia at Izyum

Russia-Ukraine War: What Happened on Day 18 of Russia's Invasion of Ukraine - The New York Times