Can you try typing some nonsense domain into your browser bar like afedlfjaoifheoa.com/test.html to make sure the computer you are using isn't infected with spyware, i.e. that you do not get redirected to the same Russian site as a result of any 404 on your computer.
Like I said, the only way I could imagine you ending up on a Russian site from this site is that there was an ad displayed automatically by Google and you accidentally clicked it, but that wouldn't cause you to be repeatedly redirected to the same site and it also wouldn't be possible if the site is very scandalous (e.g. R-rated or illegal) since Google does not allow such sites to advertise on it.
Pressing your back button could have been problematic, and may have even been generating an 'already uploaded' error but since you didn't see such an error message and were ending up on this other page, some other problem(s) must also be going on. The only thing I can think of is that there was a 404 error on our end and a hijacked browser issue on your end.
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"That virtue we appreciate is as much ours as another's. We see so much only as we possess." - Henry David Thoreau