Rude gestures are rare on postage stamps, but Ukraine's best known stamp has one. It shows a soldier raising the middle finger to a Russian warship in reference to a stand-off at Snake Island on day one of the full-scale invasion nearly three years ago.
The Russians demanded surrender but the Ukrainians refused, using unprintable language.
The warship in question, the cruiser Moskva, was sunk by the Ukrainians two days after the stamp was issued, and it sold out within a week of going on sale.