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Two 
 Ukrainian boxing world champions have joined what is 
 the greatest fight of their lives. The two are brothers, and they have vowed to take up 
 to help defend the Ukrainian 
 Kyiv. Vitali Klitschko, 50, is the current 
 of Kyiv. He retired from a 
 career in boxing in 2013, having been heavyweight champion for over a 
. He told reporters that he would fight. He said: "I don't have another choice. I have to do that. I'll be fighting. It's already a 
 war." Vitali's brother Wladimir, 45, dominated the heavyweight and superheavyweight 
 for 15 years. He tweeted: "Destruction and death come upon us....We will defend ourselves with all our 
 and fight for freedom and democracy."