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Flowers and candles rest on a memorial dedicated to the Katyn victims, to mark the 75th anniversary of the Soviet invasion of Poland at the start of WWII, in Katowice, Poland on September 17, 2014. Poland marks the 75th anniversary of the outbreak of World War II Monday with one eye on Russia, which invaded it during the war and is now throwing its weight around in neighbouring Ukraine. AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)

Flowers and candles rest on a memorial dedicated to the Katyn victims, to mark the 75th anniversary of the Soviet invasion of Poland at the start of WWII, in Katowice, Poland on September 17, 2014. Poland marks the 75th anniversary of the outbreak of World War II Monday with one eye on Russia, which invaded it during the war and is now throwing its weight around in neighbouring Ukraine.   AFP PHOTO/JOE KLAMAR        (Photo credit should read JOE KLAMAR/AFP/Getty Images)