Later on Monday, US Vice President Joe Biden is anticipated to discuss how he sees the conflict in Ukraine as a fight for democracy.
As part of his three-day trip to Poland, he will deliver his speech in the nation's capital, Warsaw.
After the president of Russia accused the West of starting the war, it will happen shortly after.
To reaffirm America's support for Kyiv, Mr. Biden paid a surpise visit to Ukraine on Monday.
Days before Russia's complete invasion of Ukraine marks its first anniversary, both leaders deliver competing speeches.
The US president is anticipated to make a point in Warsaw about the crucial role that America played in rallying support for Ukraine against Russian aggression from the West.
The extent of US involvement is being questioned by some politicians at home, so he will also be attempting to strengthen support for his policy there.
In his annual state of the nation address earlier on Tuesday, Russian President Vladimir Putin accused the West of being hypocritical and of abandoning "fundamental agreements.".
To rousing cheers, he said, "I want to reiterate: it is them who are responsible for the war, and we are using force to put an end to it.
In addition, Mr. Putin reaffirmed his erroneous claim that Moscow had been under a Nazi threat from Ukraine, which he used as justification to start his "special military operation.".
Prior to his speech, US President Joe Biden will meet with Poland's Andrzej Duda and other allies in central Europe to discuss bilateral cooperation and bolstering NATO's ability to deter aggression.
Following the president's Monday meeting with his Ukrainian counterpart, Volodymyr Zelensky, in Kyiv, the US has pledged to support Ukraine for "as long as it takes" in a press conference.
We are completely confident that you will keep winning, he added.
The two also went to a memorial for soldiers who have lost their lives in the nine years since Russia annexed Crimea and its proxies took control of some territory in the eastern Donbas.
Following the visit, US Secretary of State Antony Blinken unveiled a new $450 million (£373 million) package of security aid for Ukraine along with an additional $10 million in emergency aid to maintain Ukraine's energy infrastructure.
Later this week, there will also be an announcement of a fresh round of sanctions against people and organizations "that are trying to evade or backfill Russia's war machine.".
One of Ukraine's strongest allies, the US has already provided billions of dollars in military aid.
Despite repeated requests from Ukraine, Mr. Biden recently announced that the US would send 31 battle tanks and longer-range missiles but has so far refrained from sending F-16 fighter jets.
However, Mr. Zelensky claimed on Monday that he had spoken with Joe Biden about the potential for additional US weapons to be sent.