Russian shelling of Kyiv intensified Tuesday morning as the leaders of Poland, the Czech Republic, and Slovenia were setting out on a trip by train to the Ukrainian capital on a European Union mission to meet with the country’s top leadership. “In such critical times for the world it is our duty to be where history is forged,” Poland’s Prime Minister Mateusz Morawiecki said in a statement announcing the trip to Kyiv, which had been kept secret for security reasons. “Because it’s not about us, but about the future of our children who deserve to live in a world free from tyranny,” he added, while calling Russian President Vladimir Putin’s “special military operation” in Ukraine an act of “criminal aggression.” In his message, Morawiecki cited an ominous warning from Poland’s now-deceased former President Lech Kaczynski about the risk that Putin would not stop at invading Ukraine. “Today Georgia, tomorrow Ukraine, the …