Donald Trump has pivoted from pressing Ukraine to surrender territory to suggesting it's able to win all its land back. Trump has acknowledged that Moscow is in "big economic trouble", which strengthens the case for Ukraine prevailing with Western help. Thirdly, it could be more about domestic politics, with the president under bipartisan scrutiny at home over his "softly, softly" approach to Russia. Whatever the reason for his change of heart, and whether it translates into US policy, the last three days have shown an emboldened Trump. Place him in front of a microphone or online, and it's Trump versus the world.