St. Petersburg, Russia(CNN) Among the world leaders who joined Queen Elizabeth II and other heads of state to commemorate the 75th anniversary of D-Day, one was conspicuously absent: Russian President Vladimir Putin.
At first glance, that makes sense: The Soviet Union did not take part in Operation Overlord, the massive amphibious invasion that laid the groundwork for the liberation of western Europe in World War II.
But Putin has attended in the past. In 2014, he attended the 70th anniversary of the 1944 Allied landings. Asked on Thursday why he was not invited, Putin dismissed the suggestion that he was deliberately snubbed.
"As to whether I was invited or not, we also do not invite everyone to every event," Putin said. "Why do I have to be invited everywhere to some event? Am I a wedding general, or what? I have enough of my own business. This is not a problem at all."
But Putin also used the question to draw attention to a longstanding Russian grievance: The perception that the Soviet population's massive sacrifices in World War II have been somehow overlooked in the West.
"As for the opening of the Second Front, I draw your attention to the fact that this is the Second Front," Putin said, referring to the Normandy landings. "The first was with us. If you count the number of divisions, the strength of the Wehrmacht [the German army] who fought against Soviet troops on the Eastern Front, and the number of troops and equipment that fought on the Western Front from 1944 on, then everything will be clear."
The war on the Eastern Front, known in Russia as the Great Patriotic War, took a horrific toll, costing the Soviet Union more than 25 million military and civilian lives -- more than any other country lost during the war. The war against Nazi Germany, in the Russian view, ended decisively with the fall of Berlin to the Red Army in 1945.
It's a touchy subject for Russia. Veneration of the Soviet war dead has been elevated to something approaching a secular religion in Russia, particularly after the collapse of the USSR and the demise of Communism as a guiding ideology.
But the past isn't past for Russia. The long shadow of World War II still hangs over Russia's foreign policy.
In comments ahead of the D-Day commemorations, Russian Foreign Ministry spokesperson Maria Zakharova took a swipe at the ceremony, saying: "The Normandy landings were not a game-changer for the outcome of WWII and the Great Patriotic War. The outcome was determined by the Red Army's victories -- mainly, in Stalingrad and Kursk. For three years, the UK and then the US dragged out opening the Second Front."
Zakharova's remarks drew immediate condemnation.
"The USSR bore the brunt of the fight +lost 20 million people!" wrote retired US Ambassador (and former State Department spokesperson) Nicholas Burns on Twitter. "It was the key ally. The U.S. sent significant supply of planes, tanks+munitions to the Red Army. But simply wrong for Moscow to discount the heroism of our soldiers on D-Day—a turning point of the war in the West."
Steven Pifer, the former US ambassador to Ukraine, was more cutting.
"Let's see. Why was Putin not invited to D-Day commemoration?" he wrote on Twitter. "Is it: (A) Red Army played no part in Normandy invasion (B) Russia today conducts low-intensity war against its neighbor, having made biggest land grab in Europe since WW II I'm going with: (C) Both of the above."
Pifer here was referring to the annexation of Crimea in 2014 by Russia, a move many world leaders have seen as a dangerous break from the post-war order in Europe after 1945 -- and one that for some appeared to have historic parallels with Hitler's annexation of the Sudetenland in 1938, a prelude to World War II.
That may seem like ancient history, but Russia keeps replaying it. Zakharova has dedicated considerable time in her briefings decrying the "Munich betrayal" -- the 1938 agreement ceding the Sudetenland to Germany. Highlighting the piece of paper that UK Prime Minister Neville Chamberlain waved on returning from Munich presents a convenient counter-argument: It allows Russia to gloss over the Molotov-Ribbentrop pact, the nonaggression pact between Hitler and Stalin that paved the way for the German invasion of Poland in 1939 and the Soviet invasion a few weeks later.
In short, the memory and massive sacrifice of World War II is still a way for Russia to claim the moral high ground both in current affairs.
In his comments on the D-Day celebration, Putin claimed about the "glorification of Nazism" that was going on in Ukraine and the Baltic states, a familiar Russian propaganda line that continues -- despite the fact that Ukraine, for instance, just elected an ethnically Jewish president. For the Kremlin, Soviet suffering in World War II is a megaphone that drowns out all other argument.