"A decision was announced to suspend American aid for Ukraine and to possibly begin lifting sanctions on Russia from the American side," Tusk said at the start of a Cabinet meeting.
"Reports coming from the border, from our hub in Jasionka ... confirm the announcements from the American side," he added.
"This, of course, makes the situation more challenging for Europe, Ukraine and Poland, but we must deal with it," Tusk also said.
The Rzeszów-Jasionka logistics hub in southeastern Poland near the Ukrainian border serves as a key transit point for Western aid to Ukraine as Russia's war stretches into its fourth year.
'A sovereign, pro-Western Ukraine means a stronger and safer Poland'
Earlier in the day, Tusk said on social media that "a sovereign, pro-Western Ukraine" capable of defending itself against Russia is crucial for Poland’s security.
"In the political turmoil and growing chaos, this is what counts most," Tusk wrote on X.
"Whoever questions this obvious truth contributes to Putin's triumph," he added.
Tusk's comments followed media reports that US President Donald Trump on Monday paused military aid to Ukraine in the wake of his clash with Ukrainian leader Volodymyr Zelensky at the White House last week.
Polish, Ukrainian FMs discuss Trump's pause on Ukraine aid
Meanwhile, the top diplomats of Poland and Ukraine spoke on the phone on Tuesday to discuss Trump's decision to pause military aid to Kyiv, according to the Polish foreign ministry.
"Today, Polish Foreign Minister Radosław Sikorski held a phone call with Ukrainian Foreign Minister Andrii Sybiha," the Polish foreign ministry said on X.
"The conversation focused on US President Donald Trump's decision to suspend aid to fighting Ukraine and the consequences of this decision," it added.
Trump didn't consult allies, situation 'very serious': spokesman
Polish foreign ministry spokesman Paweł Wroński told reporters on Tuesday that Trump had decided to pause military aid to Ukraine without consulting allies.
"This is a very important decision, and the situation is very serious," Wroński said.
"This may sound banal, but it carries significant political weight—the decision was made without any information or consultation, either with NATO allies or the Ramstein Group, which supports Ukraine in its fight," he added.
Washington's move comes as Trump shifts US policy on Ukraine and Russia, adopting a more conciliatory stance toward Moscow since taking office in January, the Reuters news agency reported.
It cited a White House official as saying that "President Trump has been clear that he is focused on peace" in Ukraine.
"We need our partners to be committed to that goal as well," the official said on Monday, according to Reuters. "We are pausing and reviewing our aid to ensure that it is contributing to a solution."
Poland's top politicians reaffirmed their support for Ukraine after a tense meeting between Trump and Zelensky in the Oval Office of the White House last Friday devolved into a shouting match over Russia's war and Washington's assistance to Kyiv.
The Ukraine Defense Contact Group, also known as the Ramstein Group, was established in response to Russia's invasion of Ukraine.
It brings together more than 50 countries and organisations to ensure regular military assistance to Ukraine, including weapons supplies, soldier training and equipment repairs.
Russia launched a full-scale invasion of Ukraine on February 24, 2022, starting the largest military conflict in Europe since World War II.
Tuesday is day 1,104 of Russia's war on Ukraine.
(gs)
Source: Reuters, IAR, PAP