'Horrified': Roger Federer and Mirka's stunning act in Ukraine war

Roger Federer and his wife Mirka have made the stunning decision to donate $500,000 to a foundation in Ukraine after once again condemning Russia's invasion.

Federer, who has been off tour since Wimbledon in 2021, has once again called for peace in Ukraine after world leaders continue to place sanctions on Russia due to Vladimir Putin's invasion.

'SORRY': Nick Kyrgios' classy act after 'dangerous' ball kid moment

WILD: Nick Kyrgios drags Ben Stiller into ugly exchange at Indian Wells

'SO IT BEGINS': Nadal's brutal response to cheeky Kyrgios act

And in a stunning move, Federer has joined big names in committing to donate $500,000 ($AUD 637,000), which will go to the foundation War Child Holland.

Federer said his family have been 'horrified' at the war in Ukraine and said they "stand for peace".

"We will provide assistance to children from Ukraine who need care, about 6 million Ukrainian children are currently out of school and it's a very critical time to provide access to education and would like to support them to deal with this extremely traumatic experience," Federer said on Twitter.

The foundation will help educate the millions of children impacted by the war and help them deal with the horrific experience.

"Through the Roger Federer Foundation, we will be supporting War Child Holland with a donation of $500,000 to establish access to continued schooling for Ukrainian children," the Swiss added.

Ukraine tennis star, Elina Svitolina - now married to Gael Monfils - praised Federer's donation to her home nation.

Former Ukrainian tennis player Sergiy Stakhovsky - who has taken up arms to defend Ukraine - recently revealed Federer's foundation had been active in helping children from Ukraine impacted by the war.

Federer recently revealed his desire to return to the court soon following a reoccurring knee injury, which has kept him sidelined for around nine months.

Ukraine star praises Novak Djokovic for support

Stakhovsky recently revealed Djokovic's support for him and Ukraine during the invasion.

While Djokovic has faced the world's scrutiny over his anti-vaccination stance and the fallout from his deportation from Australia, Stakhovsky has shared a side of the 20-time grand slam champion that may go some way to changing the public perception of the Serb.

The former World No.31 posted a screenshot to his Instagram account that showed a WhatsApp exchange between himself and Djokovic, and a touching offer of help from the Serb.

“Thinking of you... hope all calms down soon,” Djokovic said in a series of messages to Stakhovsky.

“Please let me know what would be the best address to send help. Financial help, any other help as well...”

Stakhovsky replied with a love heart and a thank you emoji, before revealing that he was on the ground in Ukraine's capital, Kiev.

The recently retired tennis star left his wife and kids in Hungary to join other Ukrainian athletes in taking up arms to defend his homeland from Russian President Vladimir Putin's invasion.

Click here to sign up to our newsletter for all the latest and breaking stories from Australia and around the world.