Red colour was  a symbol of beauty in eastern Slavic cultures. Commies adopted it and discredited it. Now people around the world associate red with commies.  Just like Nazi adopted the ancient symbol swastika and discredited it.

In  Russian , red is krasniy (красный), which is synonymous with beauty – ‘kras’. The original meaning of the Red Square in Moscow was the beautiful square. There are many Kremlins in Russia that served a purpose similar to those of the castles in the west. The most famous one is in Moscow. It’s not surprising Moscow Kremlin was painted in red colour long before commies appeared. Traditional costumes of Ukrainians, Belarusians and Russians have plenty of red embroidery.