UKRAINIAN police said yesterday that a French ultra ­nationalist arrested last month was planning attacks during the Euro 2016 football tournament.

Gregoire Moutaux was taken into custody on Ukraine’s border with Poland on May 21 with an arsenal of guns and explosives in his possession.

French investigators found T-shirts promoting a far-right group when they raided Mr Moutaux’s home near Nancy days later.Ukrainian agents had been following him since December and had allowed him to buy five machine guns, two rocket-propelled grenade launchers, 275 pounds of TNT, 100 detonators and other weapons.

Mr Moutaux also bought 20 balaclavas before he was arrested at the Yahodyn border crossing between Ukraine and Poland last month, the Ukrainian Security Service (SBU) said.

He arrived in eastern Ukraine last year and was “trying to establish ties with with military units fighting in Donbass under the guise of volunteering,” the Ukrainian agency said.

Ukrainian neonazi militia battalions have have been incorporated into the army in the past year after being accused of torture and murder in the dirty war againts anti-fascist Donbass forces.

SBU security agency chief Vasyl Hrytsak said the suspect had planned 15 attacks on bridges, motorways, a mosque and a synagogue.

“The Frenchman spoke negatively about his government’s migration policies, the spread of Islam and globalisation,” the SBU said.

“He also said that he wanted to perpetrate acts of terror in protest.”

But it was unclear whether he planned to attack the tournament itself. Paris police prefect Michel Cadot told reporters there was “no specific threat to any site” linked to Euro 2016.