As U-turns go, it's a game-changer.

Donald Trump has swung from pressing Ukraine to surrender territory to suggesting it's able to win all its land back .

Yes, that's the same Mr Trump who threw Ukraine's President Volodymyr Zelenskyy out of the White House in February and brought Russia 's president Vladimir Putin in from the cold last month .

European leaders had flown to Washington en masse in August to urge caution in his dealings with Mr Putin.

"He let me down," Mr Trump told reporters during last week's state visit to the UK.

The US president's dramatic change of heart is the culmination of a remarkable three days in his diary.

Whether he's in front of a microphone or posting on social media, it's Donald Trump versus the world.

A string of bold remarks -

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