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By Tracie Potts
(NBC News) 70 years ago today the largest ever amphibious invitation led to the end of World War II.
More than 150,000 American and allied troops rolled ashore on the beaches of Normandy, France.
President Obama is there this morning along with other world leaders to remember that day.
The enemy back then was Nazi Germany today, it's Russia. And even though both countries presidents will stand together in Normandy today, there are no longer united.
Today they're on opposite sides of the conflict in Ukraine. "If Russia provocations continue, G7 nations are ready to put in additional costs." President Barack Obama
As president Obama visits the cemetery and dines with 17 world leaders today. All eyes are on him and Russian president Vladimir Putin. Their first face-to-face encounter since Russia invaded Ukraine. "Should we have the opportunity to talk, I will be repeating the same message that I've been delivering to him throughout the crisis," said President Barack Obama.
The U.S. and Europe are giving Russia a month to recognize Ukraine's new president, stop arms from crossing the border and stop supporting pro-Russian separatists. "This is an opportunity, we hope, for Russia, the United States and others, all of them to come together in an effort to try to make Ukraine strong economically," said Secretary of State John Kerry.