President Donald Trump said the 100th anniversary of the Bolshevik Revolution in Russia, which was marked on Tuesday, be declared as the "National Day for the Victims of Communism".
The declaration was made one day before President Trump, currently on a 12-day tour of Asia, leaves South Korea for China.
"Over the past century, communist totalitarian regimes around the world have killed more than 100 million people and subjected countless more to exploitation, violence and untold devastation," the White House said in a statement.
"Today, we remember those who have died and all who continue to suffer under communism," it added, stressing the United States' determination to "shine the light of liberty for all who yearn for a brighter, freer future".
Trump has previously referred to President Xi Jinping as a "friend," and praised him on Tuesday as being "very, very helpful" in dealing with the threat posed by North Korea.
Addressing the South Korea's national prliament, Trump offered North Korean leader Kim Jong-un what he called "a path towards a much better future".
"The weapons you are acquiring are not making you safer," Trump said, in what he described as a direct message for Kim. "They are putting your regime in great danger."
"Yet despite every crime you have committed against god and man," he went on, "we will offer a path towards a much better future". (AFP)