Andy Murray donated his prize money for the rest of the year to those in need after seeing images of children suffering in Ukraine.
The former world number one is working with Unicef.
More than two million people have left the country because of the attack by Russia.
The stories, the footage, the images that everyone around the world has seen have been brutal.
I cannot imagine what it would be like to live through that. I have children of my own, and when I see them suffer, it's difficult to watch.
Murray, who is an ambassador for Unicef UK, said to draw attention to it and to try and raise as much money as possible. Hopefully that will help kids with their education and get clean water.
Russia and Belarus have been banned from international team competition by tennis in response to the invasion.
The players from the two countries can still compete as a group, even though they can't play under their own flags.
Murray said it was a really difficult question whether players from the two countries should be allowed to compete.
The general feeling is that the individual athletes haven't done anything wrong, and I have had a few discussions about that with various people.
It makes sense to ban them from the team competition.
I don't know how I would feel about tennis stopping individuals from competing. I don't know if the tours would be sued if that was the case, or tournaments would be sued by those players, so I think that's more a decision for governments to make.
Murray spoke before the start of the Indian Wells Open on Wednesday.
The world number 88 is competing without a coach but that will change when Ivan Lendl returns to his team next month.
They will spend several weeks training together in the US after Murray skips the clay court season.
The man with whom Murray won two Wimbledon titles, the 2012 US Open and two Olympic gold medals is no longer with him.
It is great that Ivan has agreed to work with me.
I know a lot of people had lost faith in me, so for him to still believe that I can achieve great results helps me a lot.