Sept. 23 (UPI) -- President Donald Trump said Tuesday that Ukraine could win back all of its territory seized by Russia, marking a reversal in his skeptical stance toward Kyiv.

Trump made the remarks in a social media post the same day he met with Ukrainian President Volodymyr Zelensky on the sidelines of the United Nations General Assembly, later praising the bravery of the country's armed forces during a media availability.

Previously, Trump has insisted that Ukraine give up land to Russia as part of any peace deal. But as Russia's invasion of Ukraine, now past the three-year mark, has dragged on, Trump's outlook is showing signs of souring on the Kremlin and Russian President Vladimir Putin.

"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. "With time, patience, and the financial support of Europe and, in particular, NATO, the original Borders from where this War started, is very much an option."

Russia is estimated to control about 20% of Ukraine's territory, an area about the size of Ohio.