US President Joe Biden ends his trip abroad in Poland, where he met with Ukrainian officials and the Polish President.

Biden is meeting with Ukrainian refugees before delivering what the White House calls a “major speech” this afternoon.

The US President, in his talks with Polish President Andrzej Duda, said peace in Europe is directly linked to stability in the United States, adding that the absence of certain actions in two world wars “comes back to haunt us”. . Biden also called Article 5 of NATO “a sacred covenant.”

Earlier, Biden stopped at a meeting between Ukrainian Foreign Minister Dmytro Kuleba and Defense Minister Oleksii Reznikov and their American counterparts, Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin. . Reznikov said he felt cautiously optimistic after the encounter.

The United States has assured that there will be additional defense support for Ukraine, Ukrainian Foreign Minister Dmytro Kuleba said.

Biden’s trip follows a series of emergency tops this week in Brussels.

After those summits, Biden said he supported Russia’s ejection from another summit, the Group of 20, which is due to meet in November, although other members of that group are expected to sign. And he issued a vague warning that the United States would react to the potential use of chemical weapons on the battlefield.

But he maintained his view that direct US military intervention in Ukraine would spell disaster and defended a sanctions regime that has so far failed to stop Russian President Vladimir Putin from stepping up his assault.

CNN’s Kevin Liptak contributed to this post.