One of the weirdest websites I got: http://www.dkonikoff.com Visit with your speakers on and refresh to get another version of the animation ;)
So it could be blockade not for countries but certain IP addresses. Or maybe your location isn't recognized well by their system. Khalinov, do you...
Using different browser won't fix this error. I'm almost sure that those websites are blocked for users outside the US (at least in Poland) :( I'm...