The Source With Caitlin Collins on CNN's Shark Week

Paperwork and photographs obtained exclusively by the London-based Russian investigations group the Dossier Center, and shared with CNN, and other news outlets, reveal details the Kremlin shrouds from public view. The fact that Putin uses a train is well known. The Kremlin itself has released images of meetings held on board, in an ornately decorated boardroom. The contents of the train’s other 20-odd cars, however, have been a closely guarded state secret. CNN's Matthew Chance has details on Putin's secret train. And President Biden met with the United Kingdom's King Charles today but did he follow proper royal protocol? Anderson and CNN Royal Commentator Sally Bedell Smith discuss the historic visit.

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