The 2014 Winter Olympics in Sochi, Russia, open in February, just 100 days from now.
The games have already given rise to some superlatives: most expensive (at more than $50 billion), most heavily guarded and, potentially, most controversial.
Here are key questions surrounding the Sochi games, and some answers:
An Islamist militant leader has called on Muslim fighters to attack the Olympics. Can Russian officials keep visitors and athletes safe?