As he marks 100 days since returning to office for his second term, US President Donald Trump is facing countless challenges, many of his own making. Trump's threats to take over Panama, Greenland and Canada have left old alliances in tatters. On-off tariffs have sent markets lurching. A public meltdown with Ukrainian President Volodymyr Zelensky in the Oval Office shocked allies in Europe. Despite his pledge to end it within 24 hours, the war in Ukraine grinds on, as does the conflict in Gaza. FRANCE 24's Etienne Paponaud and Peter O'Brien recap the first 100 days of Trump's explosive return to power.