Donald Trump disparaged the Russian military and backed Ukraine to retake all its occupied territory in an astonishing about-turn on the war.
In a post on Truth Social, made after talks with Volodymyr Zelenskyy at the United Nations in New York, the US president said a return to “the original borders from where this war started is very much an option”.
“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,” he wrote.
Mr Trump said “time, patience, and the financial support of Europe and, in particular, NATO” could help Kyv win back lost territory, and said Russia was in “economic trouble”.
He said Moscow had been “fighting aimlessly” for three-and-a-half years – and had it been a “real military power” it would have defeated Ukraine in less than a week.
“This is not distinguishing Russia. In fact, it is very much making them look like ‘a paper tiger’,” he added.
Mr Zelenskyy told Sky News US correspondent Mark Stone it was a “big shift” from his US counterpart.
He later admitted he was surprised by Mr Trump’s comments, telling Fox News’ Special Report he has a better relationship with the president than before.
Read more: Why emboldened Trump has changed his stance on Ukraine
Trump’s patience not ‘infinite’
Mr Trump also appeared to pour cold water on his hopes of persuading Vladimir Putin to sign a peace deal.
Speaking to Emmanuel Macron at the UN summit, he said their relationship had turned out to be meaningless.
Just last month, Mr Trump rolled out the red carpet for the Russian president at a summit in Alaska – in a push to expedite the war’s conclusion.
Before returning to the White House, he repeatedly claimed he’d be able to end the conflict in 24 hours.
Speaking at the UN Security Council, his secretary of state, Marco Rubio, admitted ending the war had proven an “extraordinary challenge”.
He said Mr Trump had “worked on it tirelessly”, but warned Russia his patience is not “infinite”.
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The US president has previously suggested Ukraine will never be able to reclaim all the territory Russia has occupied since seizing the Crimean Peninsula in 2014.
Ukraine has lost large areas of land in the east of the country.
In the Donetsk region, Russia now controls about 70% of the territory. Kyiv’s forces have been pushed back to four cities analysts have dubbed the “fortress belt”.
Moscow has partly annexed three other regions, too: Luhansk in the east, Zaporizhzhia and Kherson further west.
The situation in Ukraine on 19 September
Trump tells NATO to shoot down Russian jets in its skies
Meanwhile, Russia appears to be provoking its neighbours to the west. Last week, Estonia said three Russian MiG-31 fighter jets violated its airspace for 12 minutes before Italian NATO jets escorted them away.
The week before, about 20 Russian drones entered Polish airspace, prompting NATO jets to shoot some of them down and the alliance to beef up its defence of Europe’s eastern flank.
While talking to Mr Zelenskyy at the UN, Mr Trump was asked by reporters whether he thought NATO should shoot down any Russian planes that entered NATO airspace.
“Yes, I do,” Mr Trump replied.
On Truth Social, he said the US would continue to supply weapons to NATO, and it was for the alliance to “do what they want with them”.
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Mr Trump also suggested the Russian people are not aware of “what is really going on with this war”.
He added: “Most of their money is being spent on fighting Ukraine. Putin and Russia are in big economic trouble and this is the time for Ukraine to act.”
He has called on European and NATO allies to increase economic sanctions on Moscow.
In a joint statement following the president’s comments, G7 foreign ministers said discussions were ongoing about additional economic sanctions on Russia.
