At ceremonies on the beaches of northern France, where the biggest amphibious assault in history was launched in 1944, heads of state, royalty and prime ministers rubbed shoulders with hundreds of veterans, now in their 90s, who risked their lives to liberate Europe from Nazism.
"This day, which began in chaos and fire, would end in blood and tears, tears and pain, tears and joy at the end of 24 hours that changed the world and forever marked Normandy," French President Francois Hollande said as he opened the ceremonies.
Around 1,800 veterans from Britain, the United States, France, Canada but also Russia and Poland, will honour the sacrifice of thousands of their comrades who fell on D-Day, many of them marking the occasion for the last time given their advanced age.
The D-Day ceremonies will give world leaders feuding over the Ukraine crisis a rare common purpose but the diplomatic wrangling over the worst East-West confrontation since the Cold War started in earnest on Thursday and was set to continue throughout the anniversary.