US President Joe Biden arrived late Monday in the Polish capital, Warsaw, after making a surprise visit to the Ukrainian capital, Kiev, the first of its kind since the war began.
Biden is expected to meet his Polish counterpart, Andrzej Duda, and senior leaders of the country, which is considered the largest European supporter of Ukraine after the outbreak of the war.
Biden had left his country to Ramstein Air Base in Germany, where his presidential plane was refueled before heading to the city of Rzeszow in southeastern Poland, after which he took a car for a full hour to the city of Przemysl located along the border between Poland and Ukraine, and from there he took the train for 10 hours to get to Kiev.
Biden will meet the Polish president to discuss collective efforts to support Ukraine and praise Poland for helping the United States and other countries facilitate the delivery of military and humanitarian aid.
And the Reuters news agency quoted Duda's assistant as saying that he would discuss with Biden increasing the presence of the North Atlantic Treaty Organization (NATO) in Poland and strengthening its security.
On Tuesday evening, Biden will deliver a speech on how the United States helped mobilize the world to support Ukraine as the war enters its second year with no end in sight, while on Wednesday he will meet with representatives from other eastern European countries that are members of NATO.
"As you have heard many times, President Biden will make clear that the United States will continue to support Ukraine for as long as it is necessary," White House national security spokesman John Kirby said.
Biden's arrival in Warsaw on Tuesday coincides with Russian President Vladimir Putin's annual State of the Union address.
Kremlin officials said his speech would focus heavily on what Russia calls a "special military operation" in Ukraine and its implications.