SBU security service chief Vasyl Grytsak said the man intended to blow up "a Muslim mosque, a Jewish synagogue, tax collection organisations, police patrol units and numerous other locations."
The Frenchman "planned to conduct 15 terrorist strikes," Grytsak told reporters.
"He obtained five Kalashnikov rifles, more than 5,000 bullets, two anti-tank grenade launchers, 125 kilogrammes of TNT, 100 detonators, 20 balaclavas and other things.