Biden on Saturday wrapped up a two-day trip to Poland that included a meeting with American troops stationed in the country, a roundtable with charities helping Ukrainian refugees, and bilateral talks with Polish President Andrzej Duda.
His trip concluded with a major speech in Warsaw in which Biden told the world that Vladimir Putin "cannot remain in power" amid Russia's brutal war against Ukraine.
The US ambassador to Poland, Mark Brzezinski, said in a tweet on Sunday that Biden's visit "reaffirmed the strength of the alliance between the United States and Poland."
He added in his Polish-language tweet that America stood "shoulder to shoulder" with the Polish people "in the face of even the most difficult challenges."
In his speech in Warsaw on Saturday evening, Biden said that "Ukraine will never be a victory for Russia, for free people refuse to live in a world of hopelessness and darkness."
He also said in his address that the United States and its allies had "a sacred obligation under Article 5 to defend each and every inch of NATO territory with the full force of our collective power."
Article 5 of the Washington Treaty guarantees collective defence by stating that an armed attack against one NATO member state “shall be considered an attack against them all.”
"Don’t even think about moving on one single inch of NATO territory," Biden said in his Warsaw speech, in an apparent message to Putin.
'Your freedom is ours,' Biden tells Poles
Earlier on Saturday, Biden reassured Polish leaders that NATO's Article 5 was "a sacred commitment, not a throwaway, a sacred commitment that relates to every member of NATO."
He added that allies must remain "absolutely, completely thoroughly united."
“Your freedom is ours," Biden said at the presidential palace in Warsaw.
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Source: IAR, PAP