"In comparison with war, boxing is child's play."

Those were the words uttered by Oleksandr Usyk in April after he left Ukraine's front line to prepare for the rematch against Anthony Joshua, which takes place in Saudi Arabia on Sunday.

Eleven months ago, Usyk placed himself on top of the boxing world with a stunning victory over Joshua at the Tottenham Hotspur stadium – where he dominated what was only his third fight at heavyweight level.

The aftermath saw talk of a unification bout against Tyson Fury, while questions were also raised as to whether Joshua would walk away, but both of those discussions were irrelevant in the grand scheme of things.

In February, Russia stunned the world with the invasion of Ukraine and citizens took to the frontline to defend their nation, with Usyk travelling back to Kiev to fight.

Boxing, understandably, was far from the mind of Usyk, who told CNN: "I really don't know when I'm going to be stepping back in the ring. My country and my honour are more important to me than a championship belt."

Usyk will this weekend put his WBO, WBA Super, and IBF titles on the line against Joshua and shoulder the hopes of a nation who have had to cope with unthinkable trauma.

Sport, in situations like this, is largely irrelevant and few would criticise Usyk if he were to struggle in his rematch given the experiences he has endured – but he may find extra encouragement from Joshua's comments ahead of the bout.

Speaking to the Daily Mail, Joshua described the months since he lost his belts to Usyk in north London as a "nightmare", words that may sting Usyk's camp given what has transpired away from the ring.

Many would suggest Usyk, having been the underdog in the initial bout and still with limited heavyweight experience, has nothing to lose – but he would be the first to argue that is not the case.

In terms of preparation, Usyk, like Joshua, has made significant adjustments and, having been at the lower-end of the heavyweight scale for the first clash has bulked up for the rematch, while the Brit has done the opposite.

Joshua had the weight, height and reach advantage for the first bout but did not put it into effect, with it clear after the opening five rounds that he was on the back foot and his best chance of winning was a knockout – but he never pushed for a stoppage.

Usyk, now displaying added bulk, may look to be more aggressive and to take the sort of chances that Joshua passed up back in September, though that is an approach he has not shown yet in the heavyweight division.

The champion's past two bouts have gone the distance and he earned unanimous decisions but, in the heavyweight game, it is a brave approach to look to stand firm, as just a single punch can change the picture entirely.

With additional weight behind him, Usyk should be able to hit Joshua harder this time around, but the full force of his strikes may well come from a different source – the support of his nation.

Promoter Alex Krassyuk told Sky Sports that Usyk travelled across Ukraine to visit high-ranking army officials, fans and injured combatants while supporting the resistance of the Russian invasion, where he received significant support and backing to return to the ring for the rematch.

"People want him to fight. People want him to win. They all want the Ukrainian flag to be risen and the Ukrainian anthem to be heard throughout the planet," he said.

That level of support can inspire Usyk when he faces a rejuvenated Joshua.