Related, Poland is issuing an envelope and stamp to support Ukraine.
Info from Ukrainian news source as follows - (Google translate done for beginning of article, full article link below) https://life.pravda.com.ua/society/...3/25/247967/
"Polish national postal operator Poczta Polska has issued new stamps and envelopes in support of Ukraine.
The postage stamp depicts the handshake of Poles and Ukrainians, and the envelope shows Ukraine, the State Flag and the Guardian of the Independence Monument. They also say "We are with you" in Ukrainian and Polish."
The article writer expresses thanks to Poland and also mentions that Estonia issued a stamp yesterday supporting Ukraine.
And found image for the Estonia stamp -