Trusting Russians

One should be especially careful to avoid using any sounds produced by Russian uploaders, since they love changing license mid-flight. For example use Dmitry Urupin originally uploaded his sounds under public domain, but then changed the license to a proprietary one, disallowing any commercial use:
https://web.archive.org/web/20140302053923/https://freesound.org/people/urupin/sounds/192415/

This work is licensed under the Creative Commons 0 License.

https://freesound.org/people/urupin/sounds/192415/

This work is licensed under the Attribution Noncommercial License.

Ooops!

Remember: you can never trust Russians.

Russians can't be all bad. I bet you're just jealous.