Heavyweight champion Tyson Fury is with his former foe Wladimir Klitschko in spirit as he fights off Russian invaders in Ukraine. And according to Fury, if Vladimir Putin’s troops want a piece of him, all they need to to do is bring the battle to his backyard.

“When it comes to war on U.K. soil, I’ll be first up,” the English pugilist told Talk Sport.

Klitschko had spent a decade as the king of the heavyweight division until Fury defeated him by decision in 2015. Now, the former champ is joining forces with Ukrainian fighters including Vasiliy Lomachenko, Oleksandr Usyk and his own brother Vitali Klitschko, as they battle the odds to keep their country free from Putin’s Russian forces.