The announcement of a Russia vaccine attracted a lot of criticism but "so far, so good" is the verdict according to a Lancet paper after a trial on 38 participants. It did cause side effects including headaches and joint pain but nothing too serious supposedly.

I wonder if it did pass a bigger 'stage-3' trial, would America, Europe and China accept it - or will they still cling to their own versions? Or is that a stupid question?

There are 176 vaccine candidates being developed around the world. 34 are being tested on people. Eight are at stage three.