The tragidy occurred in Bucha reminded us of Katyn massacare during Wold War Ⅱ. According to the military allience between Hitler and Stalin on August 23 1939,  Stalin's Red Army attacked Poland. About 4,300 polish officiers were shot to death in Katyn and buried in the forest there. Stalin murdered them because he suspected polish officiers would resist being ruled by the Klemlin. Even when the truth of the massacare was unravled , the Soviet Union didn't admit the fact for a long time, saying "it's Nazis doing." Here again, Russia didn't admit Bucha's murdous things. We should keep in mind the old saying--War coveres up the truth.