A French citizen arrested with a “vast arsenal” of explosives and assault rifles was planning “15 attacks” to coincide with the Euro 2016 football tournament in France, according to Ukraine’s state security service.

Confirmation of the arrest of Grégoire Moutaux, 25, a suspected far-Right nationalist, came on the day the England team arrived at their French base ahead of their first game in Marseille on Saturday.

Police said Moutaux, who was seized on Ukraine's border with Poland on May 21, had amassed a “vast arsenal” including “more than 5,000 bullets, two anti-tank grenade launchers, 125 kg of TNT, 100 detonators, 20 balaclavas and other things”.