Politicians in Kyiv and Moscow were left scratching their heads Wednesday, trying to understand Donald Trump’s latest about-face on the war, after the U.S. President posted on social media that he now believed Ukraine could emerge victorious.

Ukrainian politicians were delighted, and Russian figures openly baffled, by the latest twist, which came barely a month after Mr. Trump greeted Ukrainian President Volodymyr Zelensky in the White House with a situation map and told Mr. Zelensky that Russia was “so clearly much more powerful” than Ukraine. Both sides are now wondering whether Mr. Trump intends to back up his latest position with any new help for Ukraine’s war effort.

Mr. Trump posted Tuesday on his Truth Social platform that “after getting to know and fully understand the Ukrain

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