A brief, unscripted moment on an Ankara tarmac has done what months of policy briefings could not: put the health of two of the world's most powerful men back under a global microscope.
Footage from Tuesday's NATO arrival ceremony shows Turkish President Recep Tayyip Erdoğan taking hold of US President Donald Trump's arm and steering him towards a waiting line of soldiers, after Trump appeared to head towards the wrong mark on the carpet. The clip spread quickly online, splitting viewers between those who saw a president needing to be guided and those who saw nothing more than an overly choreographed welcome. Neither leader's office has addressed the footage directly.