US President Joe Biden said on Monday in Kyiv that a year after the invasion of Ukraine, "Putin’s war of conquest is failing."

"Putin thought Ukraine was weak and the West was divided. He thought he could outlast us. I don’t think he’s thinking that right now," Biden said, standing next to Ukrainian President Volodymyr Zelenskyy, as CNN reports.

"He’s just been plain wrong. One year later, the evidence is right here in this room. We stand here together," Biden said of Putin.

Biden's visit to Ukraine, his first since the invasion, was a highly symbolic moment meant to demonstrate lasting American support for the country and its people.

The US president recalled the start of the war when the world was anxiously watching the buildup of Russian troops along Ukraine's border.

In his speech, Biden recalled how he and Zelenskyy spoke by phone as "Russian planes were in the air and tanks were going across your border."

"You told me that you could hear explosions in the background. I'll never forget that," he said.

"he world was about to change," he said, recalling what Zelensky asked him to do on that phone call: "Gather the leaders of the world. Ask them to support Ukraine."

"You said that you didn’t know when we’d be able to speak again. That dark night one year ago, the world was literally at the time bracing for the fall of Kyiv. Perhaps even the end of Ukraine," the US president said.

"One year later, Kyiv stands. And Ukraine stands. Democracy stands. The Americans stand with you and the world stands with you," he said.

Biden also said that Kyiv "captured a part of my heart."

As reported, US President Joe Biden, during his visit to Kyiv, announced a new package of US military assistance and additional sanctions against Russia for its aggression.