US President Joe Biden, while holding talks with Polish President Andrzej Duda, said that peace in Europe is directly related to stability in the United States, adding that lack of action in two world wars "has come back to haunt us."
"America's ability to meet its role in other parts of the world rests upon a united Europe, a secure Europe. We've learned from sad experience in two world wars, when we've stayed out of and not been involved in stability in Europe, it always comes back to haunt us, the United States," Biden said.
"So I've been saying for a long time, as a senator who visited here, a member of the Foreign Relations Committee, as vice president for eight years, now as President, that stability in Europe is critically important to the United States in terms of our interest. Not only in Europe, but around the world," he continued.
Biden also said that he and US leaders see NATO's Article 5 as "a sacred commitment."
Article 5 is the principle that an attack on one member of NATO is an attack on all members.
Biden said Russian President Vladimir Putin thought he'd be able to divide NATO countries with his invasion of Ukraine.
"The single most important criterion in this time-changing world ... is that NATO stay absolutely, completely, thoroughly united. There be no separation in our points of view. That whatever we do, we do in unison, and everyone — everyone — comes along," he said.
The US President also acknowledged the strain of Ukrainian refugees upon Poland, referencing the situation at the US-Mexico border.