homeland ukraine, he is actually joining the fight. former heavyweight boxing champ posted this sobering message. >> now, to stop russian aggression with anything you can have now in an hour or by tomorrow is going to be too late. please, get into action now. don't wait. act now. stop this war. >> the boxing legend's brother is the mayor of ukraine's capital kyiv. he is also a former-boxing champion. well, thank you so much for watching. our breaking-news coverage continues after the break. please, stay with cnn.