NEW: Secretary of State Marco Rubio demands transparency from Moscow following reports of a plague-related death coming from a lab outbreak in Russia. Rubio warned that it would be "reckless" to speculate without complete data, while urging Russian officials to share critical information with the global community. "Any time you hear that there's some disease that infected someone in a lab anywhere in the world, you're going to be concerned about it... I think it's incumbent upon Russia to obviously share more information with the world. That's what they should do." ▻