Digging Dan Considine's improv video in which he gives a mini-world tour of accents.
In order to think that these accents are in any way convincing you have to not have been to any of the places whose accents he's imitating. To a Brit all the British accents are way off, and even to me the Aussie ones don't sound quite right.
If I was Indian I'd probably want to punch him in the face right now. And no, Ukrainians don't sound like Canadians.