"Today, Polish Foreign Minister Radosław Sikorski held a phone call with Ukrainian Foreign Minister Andrii Sybiha," the Polish foreign ministry announced 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.
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.
The remarks came after Trump halted military aid to Ukraine following a heated exchange with Ukrainian President Volodymyr Zelensky last week.
The 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.
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Source: Reuters, IAR, PAP