Protecting the pitch: Stopping a potential Euro 2016 attack
Authorities in Ukraine say they have thwarted a plan to attack the Euro 2016 football tournament, which kicks off in France this week.
A French national was arrested while trying to cross the border between Ukraine and Poland with a van packed full of weapons and explosives.
Officials say he was motivated by far-right views and a grudge against the French government's immigration policies.
The BBC's Katty Kay discussed the arrest and the threats facing Europe with Juan Zarate, former Deputy National Security Advisor for Counterterrorism under President George W Bush. He is now Chairman of the Financial Integrity Network.
07 Jun 2016