It is very similar to a bagel, but somewhat bigger and has a wider hole. Bubliks often also have a much denser and 'chewier' texture than bagels. The bublik is acknowledged to be the progenitor of the bagel."
Also it says that sushka is the sister of the booblik. Which I doubt very much.
Take a look at sushka yourself:
It's small, crunchy and light in weight. You can eat it and crackle to the point where your coworkers hate the sound.
Or, you can brew hot sweet tea and throw it to the cup as my granny did. Sushka turns big and soft, so easy to eat when you so not have your teeth anymore (speaking of grannies).

