Speaking at the close of a consequential NATO summit in Madrid, he said the new US security assistance package would include air defence systems, artillery, ammunition and counter-battery radar.
"We are going to support Ukraine as long as it takes," Biden declared at a press conference in the Spanish capital.
He reporters that the three-day Madrid summit "was about strengthening our alliance, meeting the challenges of our world as it is today and the threats we're going to face in the future."
He noted that NATO was poised to grow larger after formally inviting Finland and Sweden to join.
Biden said: "Putin thought he could break the trans-Atlantic alliance. He tried to weaken us, expected our resolve to fracture, but he's getting exactly what he did not want."
Thursday was day 127 of Russia's war against Ukraine.
Biden on Wednesday announced that the United States would boost its military presence in Europe and create a permanent headquarters for its Army V Corps in Poland in response to threats coming from Moscow after Russia's invasion of Ukraine.
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Source: PAP, CNN, cnn.com