U.S. President Donald Trump met with Ukrainian President Volodymyr Zelenskyy on the sidelines of the United Nations General Assembly in New York on Tuesday, later saying that Kyiv, with support from Europe and the North Atlantic Treaty Organization (NATO), "is in a position to fight and win all of Ukraine back in its original form."

The remarks marked a sharp shift in the White House's position on the Russia-Ukraine conflict since Trump has for months pressed Ukrainian President Volodymyr Zelenskyy to make concessions to reach a ceasefire deal with Russia, claiming Kyiv "doesn't have the cards" in the negotiations.

"After getting to know and fully understand the Ukraine/Russia Military and Economic situation and, after seeing the Economic trouble it is causing Russia, I think Ukraine, with the support of the European Union, is in a position to fight and WIN all of Ukraine back in its original form," Trump wrote on his Truth Social platform.

Zelenskyy welcomed what he called "a very positive signal" that the United States will continue supporting Ukraine until the end of the conflict with Russia, according to Ukrinform.

The Ukrainian president said he had discussed with Trump measures to put pressure on Russia's energy network, as well as the country's financial and banking system, while Ukraine is also counting on further U.S. sanctions.

The Kremlin pushed back on Wednesday, with spokesperson Dmitry Peskov saying Moscow preferred to maintain contacts on Ukraine alongside talks on its relations with Washington.

"It would be much more consistent with our bilateral interests and the interests of the U.S. to pursue these tracks in parallel," Peskov said in an interview with RBC radio. He also noted that discussions on many key issues on Ukraine, including security guarantees and the future security architecture, would require the participation of the United States.

Commenting on their meeting, Peskov said Trump was influenced by Zelenskyy's account of what is currently happening, adding that Moscow "could not agree with everything."

The Kremlin countered that the Russian economy was stable, despite some problems caused by sanctions, and that Russian forces' slow but steady advance in Ukraine was part of a deliberate strategy, with Kyiv, not Moscow, on the back foot. "As far as we understand, President Trump's statements were made after communicating with Zelenskyy and, apparently, under the influence of a vision set out by Zelenskyy. This vision contrasts sharply with our understanding of the current state of affairs," Peskov told reporters.

"We will also have the opportunity to convey our position to the U.S., and this will be done by our Foreign Minister (Sergey) Lavrov, who will meet with his counterpart in New York on the sidelines of the General Assembly," Peskov added.

Russia remains an integral part of Europe's security, Peskov further said, and "any talk of security without Russia or at Russia's expense is, at the very least, unfounded." He also said that this would be "dangerous and unacceptable" for Moscow.

He also said Kyiv hasn't responded to Russia's initiative proposed in July on the creation of three working groups with Ukraine.

Meanwhile, a German government spokesperson said that the "basic tone (of Trump's statements) corresponds to the political goals of the German government, which for weeks and months has been working to ensure that Western pressure on the aggressor, Russia, remains high and increases," which gives Germany hope that tighter sanctions against Moscow can be discussed more intensively.

(With input from agencies)