President Joe Biden arrives at a military airport in Warsaw, Poland, on Monday. AP

Biden arrived in Warsaw late on Monday after a surprise visit to Kyiv, where he stood together with Ukraine President Volodomyr Zelensky, who is seeking more weaponry as he gears up for a spring offensive against the Russians.

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Biden will meet Polish President Andrzej Duda to discuss collective efforts to support Ukraine and thank Poland for helping the United States and other countries facilitate deliveries of military and humanitarian assistance.

In the evening, Biden will give a speech on how the United States has helped rally the world to support Ukraine as the war enters its second year with no end in sight.

US President Joe Biden (left) walks next to Ukrainian President Volodymyr Zelensky in Kyiv on Monday.

"President Biden will make it clear that the United States will continue to stand with Ukraine, as you've heard him say many times, for as long as it takes," said John Kirby, the White House national security spokesperson.

Before leaving Warsaw for Washington on Wednesday, Biden will meet leaders of the Bucharest Nine, the eastern flank NATO allies, to reaffirm unwavering support for their security.

While Biden was in Kyiv on Monday, the State Department announced a further $460 million in US aid to Ukraine, including $450 million worth of artillery ammunition, anti-armor systems and air defense radars, and $10 million for energy infrastructure.

Biden has yet to give the okay for sending fighter jets to Ukraine, as requested by Zelensky.

Reuters