Fb %d1%82%d0%b5%d0%bb%d0%b5%d0%ba%d0%be%d0%bc %d0%bb%d0%b8%d1%87%d0%bd%d1%8b%d0%b9 %d0%ba%d0%b0%d0%b1%d0%b8%d0%bd%d0%b5%d1%82

The beginning "fb" likely refers to Facebook. Without a clear, accurate decode of the rest, it's challenging to provide a precise piece for it. If this is meant to be a post or message in Cyrillic:

The string provided is:

If you could provide more context or clarify the encoded string, I'd be happy to assist further. The beginning "fb" likely refers to Facebook