Speaker of Poland's Senate, Tomasz Grodzki, and speaker of the Sejm, Elżbieta Witek, on Thursday took part in the European Conference of Presidents of Parliament of Council of Europe member states, held in Athens. When the Chairwoman of the Federation Council of the Federal Assembly of the Russian Federation, Valentina Matviyenko, started her speech, the Polish duo left the room. "It is an act of solidarity with countries whose territories are occupied by Russia," Polish Senate said in a tweet.