Wladimir Klitshcko, a former heavyweight champion, has joined the Ukrainian Army amid increasing tensions with Russia.
After Vladimir Putin's deployment to the border of almost 90,000 Russian troops, the Ukrainian government is bracing for an invasion by their neighbours.
Russia has sparked fear of an invasion of Ukraine by sending close to 90,000. troops to their border
Klitschko also joined the army reserves of his country to defend his homeland in case things escalate into war.
CNBC spoke with the 45-year old: "I signed up for the reserve for the territory forces, to defend the city of Kiev."
"Because everything is currently happening around Ukraine. Russian aggression.
"Reports have been coming in for weeks, if not months about how serious this problem is.
"One district away, my little girl goes to school.
"The school is closed at the moment because the ambassadors have returned the families.
It is the love, it is the love for my hometown. It brought me to this place today because of the love I have for my family, friends, neighbors, and my daughter.
"I took the initiative. "I am now participating in this territorial defense."
All the major superpowers, including NATO and the USA, have warned Russia that they will retaliate against any attack on the Ukraine.
Klitschko's elder brother Vitali, who is currently Kiev's mayor, is optimistic that diplomacy will prevent the Russians invading.
He stated that "Before our enemy makes an attack on Ukraine, they must sink."
"We're strong. It will be very difficult for everyone.
"We hope that our diplomats, Ukrainian diplomats will give all the knowledge necessary to stop this aggression diplomatically."
"If we don't, we must prepare to take arms in our hands to defend the country."
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