From The Gaurdian:

The image draws inspiration from the Russian president, Vladimir Putin, known to be a black belt in judo, and depicts a young judoka representing Ukraine knocking down a grown man.

The phrase “FCK PTN” in Cyrillic has been added to the lower left part of the new stamp.

And you can purchase your own stamp sheet directly from the Ukraine postal service here - they are shipping world wide! I have ordered mine it will be framed and placed on my office wall.