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President Biden on Tuesday challenged Russian President Vladimir Putin to "end the war" against Ukraine and warned that the U.S. and its allies around the world will continue to support Ukraine and push for new sanctions on the Kremlin.

Biden delivered that warning from Warsaw, Poland, nearly a year after Russia’s invasion of Ukraine and a day after making a surprise visit to Ukraine.

"One year ago, the world was bracing for the fall of Kyiv," Biden said. "Well, I just came from Kyiv and I can report Kyiv stands strong. Kyiv stands proud. Kyiv stands tall. And most importantly, Kyiv stands free."

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US President Joe Biden waves to a crowd.

President Joe Biden arrives to deliver a speech marking the one-year anniversary of the Russian invasion of Ukraine, Tuesday, Feb. 21, 2023, at the Royal Castle Gardens in Warsaw, Poland. (AP Photo / Evan Vucci)

Biden said that a year after Putin’s invasion, NATO is "more united and more unified than ever before."

"Putin is confronted with something today that he didn’t think was possible a year ago — the democracies around the world have grown stronger, not weaker; but the autocrats around the world have grown weaker, not stronger," Biden said.

"One year into this war, Putin no longer doubts the strength of our coalition, but he still doubts our conviction; he doubts our staying power; he doubts our continued support for Ukraine; he doubts they can remain unified," Biden said. "But there should be no doubt — our support for Ukraine will not waiver. NATO will not be divided and we will not tire."

Citing remarks Putin made early Tuesday, Biden said the United States and Europe "do not seek to control or destroy Russia."

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Putin speaking at his annual address

Russian President Vladimir Putin gives his annual state of the nation address in Moscow on Feb. 21, 2023. (Sergei Karpukhin / Sputnik / Kremlin Pool Photo via AP)

"The West is not plotting to attack Russia, as Putin said today," Biden said. "This war was never a necessity — it is a tragedy."

Biden said Putin "chose this war."

"Every day the war continues, this is his choice. He could end the war with a word," Biden said. "It’s simple: If Russia stopped invading Ukraine, it would end the war."

Biden said that the United States and a "worldwide coalition of more than 50 nations" will continue to ensure that Ukraine stands able to defend itself.

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US President Joe Biden delivers a speech.

President Joe Biden holds a speech at the Royal Castle after meeting with Polish President Andrzej Duda in Warsaw, Poland, Feb. 21, 2023. (AP Photo / Michal Dyjuk)

Biden also touted the sanctions placed on Russia by his administration and allied nations.

"Together, we made sure Russia is paying the price for its abuses," Biden said. "We continue to maintain the largest sanctions regime ever imposed in any country in history, and we're going to announce more sanctions this week, together with our partners, to hold accountable those who are responsible for this war."

"They will seek justice for war crimes and crimes against humanity that continue to be committed by the Russians," he said.

Biden reflected on the "extraordinary brutality" committed by Russian forces in Ukraine "without shame or compunction."

President Biden and President Zelenskyy

President Joe Biden, left, walks with Ukrainian President Volodymyr Zelenskyy during an unannounced visit to Kyiv on Feb. 20, 2023. (Evan Vucci / Pool / AFP via Getty Images)

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"They've targeted civilians with death, destruction, used rape as a weapon of war, stolen Ukrainian children, an attempt to steal Ukraine's future from train stations, maternity hospitals, schools and orphanages," Biden said. "No one — no one can turn away their eyes from the atrocities Russia is committing against the Ukrainian people. It's abhorrent."

But Biden also said that "one year after the bombs began to fall and Russian tanks rolled into Ukraine, Ukraine is still independent and free."